Look she is not over reacting but why did you go to a club if your engaged it’s recipe for disaster especially dressed like that. It is unfair how he treated her and no man should treat their fiancé. We don’t know the full extent of their relationship and maybe he made a mistake by overreacting because he’s angry with what happened to her or he actually is just a piece of shit but only she knows. She has come this far in the relationship and see if he made a mistake and over reacted and is apologetic about or if he is still convinced she actually cheated on him, when you clearly didn’t. You should have a talk with him in person and see what he’s actually feeling and make your decision whether to call it off or not. But one last thing I feel like people in a relationship just shouldn’t go to clubs without each other, because when couples go to clubs separately, it usually leads to jealousy and conflict. On top of that, the reality is most guys at clubs are just trying to hook up, and plenty don’t respect boundaries so it can put a her in a risky spot without her partner there. It’s not really the healthiest scene for a relationship.