Once a cheater, always a cheater? Can he change?

grits94
Me and my ex (also child's father) broke up because I knew he was cheating so I couldn't trust him and that caused arguments all the time. Even though I was completely faithful and did any and everything he wanted. I never had cold hard proof but I knew I wasn't crazy for thinking it. I recently found out he has another girlfriend, and I have proof this time he really is a cheater. I want to confront him and make him feel horrible because every girl he has ever been with he has cheated on but no one could ever provery any because he's sneaky. He needs to know he isn't as sneaky and trustworthy as he thinks and he needs to stop hurting women. How should I teach him a lesson with my proof of his cheating on his new girlfriend?
Once a cheater, always a cheater? Can he change?
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