Me and my girlfriend have been dating for 4 months now. I recently found out from a friend that she is in contact with her most recent ex. They broke up a week before we started dating, now I have no problem if she was to be friends with him but she never filled me in. She hid it behind my back and that's what I find shady. Do Ihave a right to be mad? What should I do? She's talked to him on the phone and met up with him on 2 occasions that I know of.