I feel like a cheat, maybe I am a

My relationship is complicated cuz i met my bf through my ex who is my guy best friend who I've known since the day we born. After relationship with him ended we went like friends with benefits and just hooked up few times. And he puts me up with my bf and we get into a relationship and we love each other but my guy bestie hooked up with me few weeks ago again first time after I'm in a relationship with my current bf. He fingered me and I kinda liked it. But i regret it now. Cuz i love my bf. But he is been avoiding me and giving less time not meeting each other. Now my guy best friend isn't even look at me. He is mad at me but idk what i did? Some says I'm still not over him and he is too. But the reason for our break up was him having feelings for another girl he not even met. She was a online girl. Later found she was a fraud. And he flirted with so many girls. He the got with my bestie at that moment whom i didn't trust and knew she is not a good person. And i was hurt. But they broke up finding her with some another girl. What am i supposed to do now i told my boyfriend about this but he didn't broke up with me and still stayed saying its all over now and keep some distance between me and my guy bestie. Ughhhh idk what to do