I don’t know how to feel

Recently me and my bf have been going through a lot. We both go to the same college and been dating for almost 2 years but ever since we got here it’s been hell. We fight a lot, more than we use to back at home and he acts so different now. We barely talk cute to each other, he use to send me paragraphs but doesn’t anymore, and he doesn’t show me off. I have talked to him about it multiple times but nothing gets better. Everybody on campus basically know we’re together but this relationship has been so horrible for almost a month now. It gets worse...... so on Friday he went to a party and it got back to me that he told one of his friends that he would talk to this one girl but there’s was to many people there that would tell me. Of course I confronted him about it but he only said he was joking. I’m so confused with this relationship, I don’t know what to do or if I should even trust him anymore. Somebody please give me good advice I’m so desperate 😩😔