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You don't have any reason to feel guilty.. the key word here is "EX"... you are both free to do what you want. And if the things she told you are really true.. that he hit her and stuff.. would you really want that kind of guy back with her doing stuff like that again?
Also your ex sleeping with someone while you were sick, and you sleeping with someone when you are both single is NOT the same thing.
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and as someone rightly pointed out..all we are going to get is second (or is it third) hand story about that your bro from the lady..
She played you like a string and got a nut...its a win win for everyone..ONTO THE NEXT STORY...