He cheated on me but he won't admit it

Reed08
I know my boyfriend cheated, he swears he didn't, the girl said no when I first asked then she said yea but I know it happened. She's not a cute girl she's really big and very tall so I'm not jealous and I know that it was just a one night stand.we've been fighting a lot but I never though he'd do this. I love him very much and he says that hell do anything for me, he won't admit he did it but I left him and when he realized I wasn't coming back he called me crying so hard like 2 days/nights in a row.i was at my parents and when I wouldn't answer my phone he came to my bedroom window trying to get me talk to him, I think he cares we've been together for a year and a half, we live together and we've were friends for like 2 and a half years before we started dating, he's not the player type never has been, he's only been with 1 girl before me and I know that for a fact. I don't know what to do. I know he doesn't care about her and it was just sex but I know I'm better than that but I love him I NEEEED help I want to work it out but I don't know if I can get passed the thought of him with another girl and I don't know how he could do this to me
He cheated on me but he won't admit it
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