Im sad give me advice

So in this situation me and this guy we’re talking and we have grown to really like each other, it was kind of like we were in a relationship, but we weren’t. Anyways he was always wary of other guys talking to me even though we weren’t together, but i would just verify him it was nothing to worry about. While we were talking i started to think about my sexuality and started questioning if i was bi. So i started talking to this female that wanted to help me experiment my sexuality. Me and her kissed and flirty but she ended up having a fiancé so i stopped talking to her, but mean while i’m talking to this guy😭☠️. Recently he found out about the situation, and he doesn’t wanna talk to me anymore. I have really grown to like him and i feel so bad for doing what i did and i just want him back. How can I get him back, and fix everything?