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You're ex might have said some slanderous things about you out of spite to your now ex that could have swayed his opinion about you. It could also be that he's bit insecure, has trust issues, a bit to jealous or he's putting his guilt on you cause he's the one that's actually cheating instead. Or he's just looking for a way out the relationship and made some ish up about you cheating just to leave. Anyway, all you can do is say you didn't cheat but if that's what he thinks then o well..
Au revoir to him I suppose.1THIS IS NOT RELEVANT ANYMORE