My boyfriend slept with my brothers girlfriend?

Hello, I have been with a man I care so much for, for years, but he needs to work on himself, so last summer I needed to leave him to work on myself and him too, and when we weren't talking he slept with my brother's girlfriend. *the same thing was happening to them*.. He says he didn't do anything wrong bc he thought he was single, but I can't stop thinking about it.. but even my brother and the girl are back together because he forgave her. So should I realize I was the reason he was single, and he could do what he wanted, and forgive and forget? Or move on
13 d
Would it be weird at family events? and they both say they don't like each other like that, that it was "meaningless sex", but aren't they still attracted to each other?
My boyfriend slept with my brothers girlfriend?
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