‘Duck Dynasty’ star’s son opens up about wife’s affair in new Lifetime film

Al Robertson doesn’t believe a marriage should always end after an affair.

The eldest son of Phil and Mrs. Kay Robertson of “Duck Dynasty” fame joins his wife, Lisa Robertson, in confronting their painful past in a new Lifetime movie titled “Faith & Forgiveness,” premiering Saturday. The film reveals how Lisa became involved in an extramarital affair 15 years into their marriage and how her beliefs eventually repaired their relationship.

“When infidelity happens multiple times in a marriage, that’s the end of it, but it doesn’t have to be that way,” Robertson told Fox News Digital. “Anything can be overcome.”

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“I think the reason I was willing to fight for my marriage was because I had made a lot of mistakes on my own,” she admitted. “When I first met Lisa, she was actually a good girl who had been through some tough things in her life up to that point, but she was actually looking for what she called a ‘knight in shining armor,’ someone who would hold her hand and save her from things. And I wasn’t that guy in the early years.”

The couple first met in the parking lot of a McDonald’s, a popular teenage hangout in West Monroe, Louisiana. Robertson was 17 and a senior, while Lisa was 15 and a sophomore. They dated occasionally before marrying in 1984. After welcoming two daughters, Robertson served as pastor at a church where his family had been members for years. Lisa found herself alone and isolated while her husband was away.

“Faith and Forgiveness” premieres May 16 at 20:00 (Lifetime)

“To be honest with you, I made a huge mistake in not attracting Lisa as a partner in what we were doing, my career and my dreams,” Robertson said. “[She] he was also dealing with all these internal things from his youth. I just didn’t recognize it. I didn’t see it.”

WATCH: AL AND LISA ROBERTSON SAY FAITH HELPED HEAL THEIR MARRIAGE AFTER DIVORCEMENT

Lisa told Fox News Digital that behind closed doors, she struggles with memories from her childhood.

“From a young age, from the age of 7, I was subjected to someone abusing me,” he explained. “I believe that when I was 7 years old, I started to be dishonest about who I was and what I was. I think the bad part played a big part in that because it kept reminding me. I think that’s where I started that trail of dishonesty, and that’s where that darkness really started. As I got older, it got worse.”

Lisa Robertson in high school. (Courtesy of Al and Lisa Robertson)

Years later, an ex-boyfriend contacted Lisa at work. He soon found himself in a relationship. In the summer of 1999, Robertson began to suspect that Lisa might have been seeing someone behind his back. He has repeatedly denied the accusations.

Al and Lisa Robertson told Fox News Digital they were moved to tears after seeing their story brought to life. (Lifetime)

“Throughout this whole thing I prayed that God would open a door for me to walk away and that no one would find out because I didn’t want to hurt Alan,” Lisa said. “I didn’t want to hurt our family. [But] I didn’t think [our marriage] he would make it. I knew if he found out, it was over. I believe everything will end, especially when you say ‘I’m leaving’. And I knew that because he always told me that. “If I cross the line, that will be the end of everything.”

Robertson used cell phone records to piece together the truth. The couple later agreed to a temporary separation.

Al Robertson in high school. (Courtesy of Al and Lisa Robertson)

“I think for the first few weeks I tended to think it was probably over,” he said. “I wasn’t sure I could ever fully trust again. [I wasn’t] I’m sure Lisa really wants to be in our marriage. Do you really know if your partner wants to stay? Do they want more than you offer?”

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Al Robertson and Lisa Robertson sign copies of their book “A New Season” at Bookends Bookstore in Ridgewood, New Jersey on January 5, 2015. (Dave Kotinsky/Getty Images)

Lisa recalls a moment when, overwhelmed and completely broken, she stepped into her backyard and cried out to God for forgiveness. During his prayer he was completely honest with God about what he was doing. He describes that moment as a turning point in his faith. He was truly ready to repent and start a new life.

“The role of faith has played a very important role in my life,” he explained. “When I surrendered my life to the Lord, in the backyard, when I finally called out to God, He came and met me in the backyard. From that day on, I think I knew I could do it because I had never called on Him before. I never asked Him for help and I never asked Him to save me.” [But] He came and saved me. “I think that was the most important thing I ever did.”

Al Robertson told Fox News Digital that he has always been inspired by his parents, Phil Robertson and Kay Robertson, and how they remained loyal to each other. (Tom Pennington/Getty Images)

Not only was Lisa baptized, but she also surrounded herself with women who had already developed a strong foundation in their faith. They worked together and lifted each other up. He was also a consultant with his wife.

Lisa Robertson and Al Robertson of “Duck Dynasty” stand backstage at the 45th Annual GMA Dove Awards held at Lipscomb University Allen Arena on October 7, 2014 in Nashville. (Terry Wyatt/Getty Images for Dove Awards)

“I changed the way I dress,” Lisa said. “I changed the way I wear make-up. I changed what I listen to. I changed the way I approach men. I changed the way I talk because I needed a mouth. I changed a lot of things.”

“But the first thing was to cry out to God. The second thing was to surround myself. [with those women]. But the third thing was counseling; “It was about finding someone who could help me get rid of the negative things in my life and finally put them to rest.”

When Al and Lisa Robertson spoke to Fox News Digital, they said they were hopeful their story would inspire other struggling couples. (Lifetime)

Robertson stated that he was unfaithful to Lisa in their early years together. Not only did she forgive him, she married him. Robertson wondered: Could he forgive, too?

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Al and Lisa Robertson are seen here with their family. (Courtesy of Al and Lisa Robertson)

“She was the thing that changed my mind and my heart about Lisa,” he said. “When I talked to friends around him, it was clear that he wanted this marriage to continue. He was very sorry for what had happened. He had finally come to a point of reckoning in his own life. He was dealing with a lot of his past through counseling, through people who had helped his life.”

Al and Lisa Robertson, Willie and Korie Robertson, and Kay Robertson arrive at the premiere of the movie “The Song” at the Franklin Theater on September 19, 2014 in Franklin, Tennessee. (Jason Davis/Getty Images for City On A Hill)

“I think it gave me the capacity to forgive infidelity because of my appreciation for not only what God had done for me, but also what Lisa had done for me,” Robertson said. “His growth as a person and as a Christian in those early weeks convinced me to say: ‘If he has the capacity to change who he is, as I did all those years ago, then I have the capacity to forgive as God forgives.’ That’s when everything changed. We knew we would find our way together again.”

Reality TV personalities Korie Robertson, Willie Robertson, Lisa Robertson, Alan Robertson, Kay Robertson, Phil Robertson and Si Robertson attend pre-race ceremonies for the NASCAR Sprint Cup Series Duck Commander 500 at Texas Motor Speedway in Fort Worth, Texas on April 11, 2015. (Tom Pennington/Getty Images for Texas Motor Speedway)

In December 1999, the couple renewed their vows. Together they are devoted to God and each other. For years, they traveled around the country talking to couples who were struggling in their relationships. They are happier than ever.

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Today, Al and Lisa Robertson enjoy spending time together at the beach, traveling, and dancing to Frank Sinatra in the evenings. (Courtesy of Al and Lisa Robertson)

“To have a truly strong and very intimate marriage — I mean not just sexual intimacy, but spiritual, physical and emotional intimacy — there must also be honesty,” Lisa said. “The most important thing you can do to have a very successful marriage is honesty. We must also take care of ourselves the way Jesus took care of us.”