What should I do

Last night my friend and I went to eat on campus and we met this guy. He was nice at first and told us he wanted friends around campus and he asked me did I have a boyfriend so I told him yeah I did. So long story short he was like okay cool do you feel like we could talk and be friends “nothing serious “ and I didn’t mind..... I went to his house and I knew something didn’t feel right because he locked the door and started taking off his clothes. I just wanted to “talk” or hang out like I do with my other guy friends but he had other plans. And I told him no and stop but he kept forcing himself on me and I always fought back. Keep in mind that he drove me off campus to where he stayed and when I wouldn’t sleep with him and when he got tired of fighting me, he told me to get out. Idk what to do or who to tell cause he didn’t rape me but it was still a forceful act and I just feel like I’m nothing right now. I want to tell my boyfriend but I couldn’t cause I don’t have a name or anything on the guy other than a nickname and he’s not always around. But I want to know if going with him was cheating or anything and also what should I do cause I’m just really confused right now. I’m thankful that I wasn’t raped but I couldn’t sleep or anything cause it kept going through my mind and not to mention he left a hickey on my neck like it was a mark of him trying to take advantage of me😥 I just need some answers about whether it was wrong to chill with him and what should I do