My girlfriend of 4 years started a new job and met someone that she seemed to like a lot. I was a tad bit jealous because of how often she talked about her/texted her and she told me that I had nothing to worry about because they were just friends even though she admitted that the girl was her type. I believed it and just tried to brush it off as me being stupidly jealous for nothing until I saw a heartbreaking message she sent to a friend detailing her feelings about this girl; she said that she loves me but I'm not as easy to talk to as this other girl and that she wants her. She also said that she wishes she was single because she shouldn't be in a serious relationship if she's having these feelings and that this other girl is so amazing and so easy to talk to that they could be open with each other after only a few days of talking. I was pretty destroyed after reading it; I confronted her about it and broke up with her but she said that she drunkenly wrote that message and that it didn't reflect how she feels at all and that she was mad at me at the time. I took her back after a while but asked her to stop talking to the other girl and she said she would. Things weren't going great because I didn't trust her and then we had an argument and I found out that she messaged her on facebook about me and it made more mad than ever and once again, she begged for me not to leave and said that she just fucked up and will do anything to show me that she actually does love me. I don't know what to think at this point, do I forgive her and try to trust her again or just end it for good?