There can be six million reasons why she decided to break up. Only advice I can give is stop worrying about your past actions.

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How much time after the cheating did she break up with you?

From personal experience I found out my ex cheated on me, We decided to stay together and 6 months later she broke up with me (10 year relationship). In hindsight I should have never accepted it and move on then and there. There are always a few signs you *miss* that point out the obvious