“It’s not just a saying that the best predictor of future behavior is relevant past behavior; that’s really true,” Dr. Phil says. “The thing that I don’t understand is how people will be toxic for years or their whole life and then come here and tell me they’re all different.”
On Thursday’s episode, Dr. Phil speaks with Jen and her ex-boyfriend and the father of her daughter, Chris. Jen claims Chris has not been an involved father and would leave her and their daughter for weeks at a time when the little girl was first born. Chris claims he’s a changed man – but admits he has not taken actionable steps.

In The Bubble Over My Head video above, Dr. Phil shares more insight into knowing when a person has truly changed.
This episode, "'My Dad Can’t Stand My Ex-Boyfriend,'" airs Thursday. Check local listings to see where you can tune in.

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WATCH: After Taping ‘Dr. Phil,’ Man Shares Message With Ex And Mother Of His Daughter