Boyfriend cheated

I just need advice my boyfriend had people come over to his house I wasn’t there. He got crossfaded, he told me he was asleep passed out and the girl just came in his room n went to sleep in his bed with him (he was already passed out). He says he was passed out and they didn’t do anything. But one of my friends that knew her told her that he had a gf. That friend texted me that he cheated on me. I had to ask for that girls snap she confirmed it but when I asked questions about it she blocked me. He swears they didn’t do anything but I don’t know what to believe. I confronted my bf about it and he swears nothing happened and that he loves me and he wouldn’t do anything like that. But apparently one of my boyfriends friends is friends with that girl who he “fucked” and she lied about the situation. I don’t know who to believe. Btw I told him I needed space. But should I break up with him. I’m just confused.