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Leo: Depending on how you and your ex broke up he'd either be nice to him or not. If he broke your heart and played with you he'd let him know what he thinks of him. If not, he'd try to be nice but not too nice - Leo doesn't want to become best friends with that guy.
Raph: Raph would dislike the guy no matter what. You're his girlfriend now and you ex should not even dare to touch you inappropriately. His alpha instincts would come out and he'd make sure your ex know his limits.
Donnie: He would be the type of guy who googles your ex. Checks his Facebook, IG, twitter, no matter what. Maybe even criminal records. He wants to know everything about that guy just in case he'll ever need it. He would use that knowledge the first time they'd met.
Mikey: Despite of what you may think of our cinnamon roll, he can be jealous as fuck. Even if you told him your ex is a good guy, that he didn't break your heart or anything, Mikey would still be jealous. He'd make his point very clear.