Who should I believe, bff or boyfriend?

k so my boyfriend went to a basketball game and my friend cheers there… on new years eve, me and my boyfriend went to a party and people were saying we were on top of each other kissing which we werent, we were only kissed a few times and people told other people and it got to my friend. She said she wouldnt tell anyone… k so continuing the basketball game, as I said my boyfriend and friend were there and she went up to him and said so I heard what you did on new years (which I thought was kinda rude, because I told her not to say anything) so my boyfriend told me and I told him to tell her shut up which was immature I know, and he did and then she got mad… so I was texting them both, my friend finally forgave me, but she said that my boyfriend was told her that she was saying crap about me and him to get me mad. My boyfriend said he didnt… I don’t know WHO TO BELIEVE!? she was my friend since preK and we had our ups and downs but he is my bofriend and right now, hes the only one I look up to because it seems like everyone hates me besides him but I dont wanna lose any of them? who would you believe please help sorry this was so long tooo and I tried to make it easy to understand sorry if its confusing