Terry admits that during his 11-year relationship with his wife, he has cheated multiple times. He says the longest relationship he had outside his marriage was 15 years - on and off - with a woman named Crystal.

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“We never officially dated. We didn’t have that normal relationship; it was a pure sex relationship,” says Terry. “I absolutely did not love her at any given time.”

WATCH: 'My Husband Is A Serial Cheater'

Terry says the relationship ended when Crystal told him she was pregnant and going to have the baby.

“She didn’t really give me much of a choice on anything. It was, ‘I’m raising this child. You can or can’t be a part of it,’” Terry claims. “I didn’t want to get involved in that relationship and be a part of that child’s life.”

WATCH: Woman Describes Learning Her Husband Fathered A Child With Another Woman

So why does Terry say he paid Crystal thousands of dollars to help support a baby he says he didn’t want – and wasn’t even convinced he fathered? Hear his explanation in the video above. And on Friday’s episode of Dr. Phil, see what happens when Terry and his wife come face-to-face with Crystal on Dr. Phil’s stage. Check here to see where you can watch.

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Woman Claims She Didn’t Know Man She Had An On-and-Off Sexual Relationship With For 15 Years Is A Married Father