My Boyfriend was the Mistress

April
I just found out that my Boyfriend was in a series of relationships in which he was "the other guy".
I don't know how to cope with the knowledge that he was ok with being the reason why relationships ended.
I am so confused and depressed right now.
He said he is a changed person but honestly, I don't know. I don't know if he is changed. I don't know if I should carry on.