My ex girlfriend broke up with me after four years of dating two weeks ago, and couldn't give me one reason why she was doing it, other than that she didn't want to be in a relationship anymore. Today I found out from someone who is a good friend of hers that she has been seeing this other guy since the day we broke up, and that they had been hanging out during the days right before we broke up. The other day, I get a picture from her, and we haven't talked since the break-up. The picture is of them two. I swear, if the dictionary had a picture for douchebag, this guy would be on it. That killed me, as if the break-up wasn't hard enough, now I gotta think about this. Surprisingly, I've been feeling better. For the first week after the break-up, I drowned myself in regret and sorrow, thinking about the horrible boyfriend that I was, and all the things I could have done to save the relationship. Then I realized, since she was in such a rush to start seeing this guy, i couldn't have been the only cause for the break-up. A large reason she broke up with me was probably for this other guy, which still hurts really fucking bad, but I don't have to go around killing myself. I'm not sure if I should delete her on facebook or not. I really want to, but I don't want her to know that I'm mad and jealous of them two, or seem immature. I've also been talking to this girl lately, I met her through a friend at a nightclub. We went out last night and danced our asses off, went back to her friend's place, and had the whole room together. Only thing is, she has a boyfriend. The entire time we're in there, I'm trying to stick to conversation and avoid hooking up, I'm even looking for something to watch on tv until we fell asleep. Well, after about an hour of drunk talking and telling jokes, she starts undressing right in front of me, turns the tv and lights off, and climbs into bed, so nonchalant like. I'm trying to play it off like it's no big deal, but my heart was poooouuunnndddiiinnnnggggg, and she starts making out with me. For some reason, I didn't let it go any farther than that. I didn't want her to wake up and feel regret after we'd had sex, and then avoid me because of it. She respected it, and said I wasn't a player like all the other guys that try to use her. She has been great in helping me get back on my feet, self-esteem wise. I took a big hit after the break-up, and at that point, you can't even dream of any other girls but your ex. Now, I find myself thinking of her a lot, but it's so fucked up because she has a boyfriend and I feel so bad about it. She said she didn't feel regret at all, and what he doesn't know won't hurt him. Her friends all know now, and word can get out soon and spread to her boyfriend. her friends have the biggest mouths, I'm not even kidding, they'll do it for the thrill of it. Sorry if all this was long, but I had to get it out somewhere. I need some advice on what to do next, this girl is fun and all, and is a great hook-up, but I'm not sure if this is all worth it. My girlfriend most likely cheated on me and then broke up with me because she felt guilty, and here I am hooking up with a girl that has a boyfriend. What have I done to myself? We live in San Diego by the way, the night life here is crazy, especially at clubs. She could have danced with anyone at that club, but she danced with me the entire time. Feels good to be wanted again, so soon after a break-up. It's a paradox really, It's helping me, but it's not helping me at the same time.