So last night me and my girlfriend were talking on the phone and I noticed she starting acting like something was wrong. So I asked her what was wrong and then she told me that she still thinks about her ex all the time.. So I asked her some questions about it like "if he started talk to you again, would you talk to him?" she said yeah and then I asked if she would hang out with him she said yeah maybe. And my final question was "if he begged for you back would you choose him over me" and she hesitated and said maybe I don't know. I felt like crying instantly when she said that and trust me I'm not a crying kind of guy.. We have been dating for a little over 4 months, her ex and her dated almost a year ago and it was only for a month.. I keep thinking about this whole situation and it's like eating away at me I don't know what to do or think.. I feel like I'm sharing her with some kid she hasn't talked to since the day they broke up. I also feel like I'm never going to be good enough to replace him and that if for some reason he started to talk to him again she would just forget about me. Am I over reacting ? Should I just let it go? What should I do?

Who broke up with who and why

Well Justin I hate to say this but she has already answered your question. She might love you but is not in love with you as she has strong feelings with her ex. The reason why I am telling you this - I also have been in this situation and believe me she will just end up cheating on you. So the question is now are you strong enough to let her go OR will you just hang in there and never to trust her. Good luck
Ps: Just a little advise, I did the first one - yes hurt like crazy but I am better for it now.