<human>: So the other day my girlfriend of 3 months decided to tell me that her ex (who cheated on her about a year and a half ago) is trying to get back with her even though he knows we are in a relationship. 

Supposedly this has been going on for a week and I was just told (not sure if that's a problem). She says told him that she is willing to be friends with him, but apparently he refuses anything less than getting back together. I've told her that this guy should fuck off, but I'm not sure why this was hidden from me and why she is even giving this guy a chance to talk to her.

I'm completely lost in this situation and I honestly feel like shit right now. Should I be worried that my girlfriend is in contact with her ex? I'm worried that this contact might lead to her having feelings for this guy again. Should I ask her to just completely ignore him? Comments, advice, anything you want to say reddit please tell me, I'm so lost right now I don't know what to do.

Condense the text into a few key points
<bot>: Girlfriend's ex wants her back, I was told a week after contact between the two occurred, girlfriend says she offered him to be friends, I feel like shit