How do I deal with cheating,trust,and moving on?

Alright, so tonight my boyfriend basically told me he cheated on me. I somewhat expected it because he has made like those mean jokes the past couple nights, like he’d say oh I did so and so with danielle… then I’d believe it and then he’d go just kidddingg, your so gullible,blah blah. I hate it, I’ve asked him to stop. Anyways, he has this friend Danielle. The girl is hideous, he’s even told me that, she has nothing, barely and tits or butt, whatever. Me and her are completely different, I’m way more full in both aspects and all that. He told me tonight that she did in fact come over last night and she brought a movie. He told me he felt bad for her and doesn’t know why he did anything with her, he says im perfect and he just felt that he should do it for her cause he knows she won’t get a guy that looks like him, hes got like a 6 pack and what not. anyways, he told me during the movie they started cuddling a bit and they gave each other back massages.. then like he said he lifted up her shirt and felt her tiny tits up and sucked on them and like felt her butt or whatever and she put her hand down his pants… and then he told me he stopped her after like a minute or so and told her he didnt want to because he loves me. I’m in shock basically and of course I don’t stop crying and whatever, but I don’t know what to do from here. I don’t want to leave him, but I’m having a hard time trusting him.. I mean he just told me tonight, so I should give it time and all, but how can I trust he stopped her, I mean he cried and all on the phone and I’m sure he feels awful about it, but I’m just confused. I knowww I’m better looking then her but he says he felt bad.. does anyone else believe this? I just have like a past of cutting myself.. and I don’t want to get so deep in depression that I resort to this again.. I’m scared, confused, frustrated. I want to just kiss him and know it will be ok, like I believe it will be, but I wanna beat the crap out of him at the same time. anddd he said he wants to still be friends with her, I do nottt want them to be, and I said that and hes all like ill be friends with who I want, so im scared. and ahhh :(

I realize to some this isnt a big deal, which I know. Like if this is true and I pretty much believe that, I don’t think much more wouldve happened.. so, I realize much worseee things couldve happened, but it still hurts ya know? so, whats everyones take on that? Am I blowing it out of proportion?