My ex wife believed I had cheated on her with one of her friends. It wasn't true and was hurtful to that friend.
We've been divorced now for a couple years. I'm now slowly making my way through her friends married and otherwise getting sucked and sometimes fucked by all that I've tried with. I haven't even tried with the one she assumed I was cheating with. They all are as sexy as my ex wife and all have been better in bed.