“Insight is the ability to see and understand why you do the things you do,” Dr. Phil says. “Insight is the number one key to change, because you cannot change what you do not acknowledge.”

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He explains this concept to Dennis, who admits that he has been a “mental and emotional abuser” to women, including to his current girlfriend, Melissa. Dennis, who has been dating Melissa for eight years – even though he’s still married to his wife of 29 years – admits his relationship with Melissa is volatile and filled with physical altercations and infidelity.

WATCH: Woman Says Father Won’t Admit To Hurting The Women In His Life

Melissa says she takes responsibility for their rocky relationship and says she believes it’s her fault that Dennis is a cheater.

“Battered women, abused women blame themselves for what goes on in relationships,” Dr. Phil says to Dennis. “You allowing her to feel that way and not disabusing her of those thoughts, exploiting those thoughts, creating those thoughts, fertilizing that, letting that grow, is very toxic.”

Hear more in the video above. And on Wednesday’s episode see what happens with Dennis and the women in his life. Check here to see where you can watch.

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