What do i do about this guy.?

my boyfriend always went out and partied. i always thought he was cheating but he reured me time and time again that he wasn't and he'd tell me if he was right then and there. he broke up with me sunday cuz of hockey and he literly has no time and im the perfect girl and he wants to pick things back up in march. but some random guy texted me and told me he slept at a college frat with some slut when we were still dating and he was like there wasn't even a girl named jess there. blah blah blah. and then he stopped answering me. and his BEST FRIEND and this other guy told me the same exact thing and that he cheated on me before that to with a fat girl for a ciggarette (2 things of mine that i do not go for) and!!! HE GOT A FRIGGEN ******** FROM A GUY. what the hell? He was totally trashed when he goes out and stuff but like oh my god. and that thing with the girl did happen at the collegefrat. he's only in 11th grade and so am i. i lost my virginity to him. and i feel like he has a part of me. but yeah like...i told him to just tell me and i won't get mad (even though i totallywould have) and he just didn't answer but was yelling at the kid who told me through texting. what the hellllll. thoughts?