Sounds like you are really just friends with the girl, right? He introduced you two, so it's his problem if he doesn't want you to be friends with her now. Just keep being her friend, if that's what you want.
Given that the only details about THEIR relationship that you offered is "things weren't quite peachy-keen between him and Y" and "things weren't quite right between X and Y", then I would say that he doesn't really have a shot anyway.
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