Hey guys. So I've been dating this guy for over a year now. He's the best thing that has ever happened to me. We are super close and share a lot of things in common. We are in our early 20's. We have both dated around plenty and we both agree this is the best relationship yet for each other.

But now I feel like it's falling apart. I told myself three strikes and I'm done with him.

FYI: We were in a long distance relationship for 6 months. I visited him almost every month.

Strike number one: He cheated on me while we were still long distance. Ex-gf basically sucked his dong for a minute until he stopped and realized what a shitty person he was being. He actually felt so bad he threw up and left. He didn't tell me for a couple days but then he broke down and told me on the phone while I was at work. Ofcourse I was beyond pissed. I had already paid for him to come out and visit me for three weeks as I traveled for work and took him with. I thought about it and said "When you come out here, you have three weeks to prove to me you want this relatioship for real." He made sure to show me how sorry he was. I've been fucked over before but I've never seen someone so sad in my life. He has never cheated on anyone until this time.

Things worked out so I gave up my life in another state and moved to be with him last year. I ended up getting an amazing job with a company I love. Things were pretty perfect for a while.

Strike two: We were drunk and arguing. He ended up shoving me around and hit me in public. I freaked out and went to go hide because I felt I was in danger. A friend of his picked me up, while he was actually at his house feeling bad and thinking it was over. We talked it out and he promised he would never do that again.

Strike three?: He has been talking to an old "friend" that he has known since he was a kid. She is the sister of one of his childhood friends. Anyway. I've always known this girl liked him. I met her at a wedding and could just tell. Can't blame her, my bf is pretty amazing. Well lately they have been chatting on Facebook. A lot. I go to bed at 10pm and he stays up all night talking to her. He claims it's nothing special. Today I saw his Facebook open and read all the IM's between them. They are clearly flirting with each other. He mentioned how she's attractive, and "fairly fucking awesome". They talk about sex, including OUR sex life. He makes himself sound like he's so fucking cool and how he controls everything during sex. This girl is just basically all over his nuts.

Basically, I'm sick to my stomache at work right now and don't know what to do. My instincts say dump him and ask him to move out. We JUST moved into our own apartment (I was staying with his parents for a while). I could afford it on my own but I would probably move because I want nothing in my life that reminds me of him if that goes down. I'm just terrified this will continue and he will eventually cheat on me. I almost just want to disappear. I'm so hurt and I feel so alone. No friends and family to help me. My hands are shaking as I type this.

What should I do?

EDIT: You guys have all given great advice. Even the people telling me to stop being an idiot. You're right and I should know better. I know what I need to do. I need to just suck it up regardless of how lonely I am going be. This will probably be the biggest test of myself. I am so fucking scared. I'm also really embarrassed it got this far.

Since I will have pretty much no shoulder to cry on I will probably update this thread later and let you guys know how it goes. Thanks again.