Lost friend

I’m a sophomore in Highschool 16M and met my friend freshman year. We grew really close in the span of just a few months, told each other everything, cried to each other and were there for each other through everything. He met this girl and she broke his heart and was just awful for him and I was there for him the whole time. This year (sophomore year) I was talking to the girl (we had been friends before my friend C dated her) and I started to gain feelings for her. I told him because I felt I should be honest with him and he said he had known and didn’t care. Well he starts talking to her again and she’s flirting with me and I tell him. He starts crying and I’m there for him then too. A while later he tells her I like her and she tells me she likes me too. He says he doesn’t care about me and her dating and against my better judgment I do.

She turned out to be very immature and just attention seeking so I broke up with her a month later. But afterwards (understandably) C doesn’t talk to me. He starts spreading rumors about me and then acts friendly with me while telling his mom I’m hitting him and he wants to move schools. We spend time apart because he hates me and I’m upset with what he’s doing but more so hating myself for betraying him. I broke the code, he was my brother and I betrayed him in the worst way.

Now we are starting to talk again and such and we’ve both apologized to each other and said we want to try and talk about our relationship (something he said before as a lie) and that we miss each other.

Now here’s where I need advice. Did I completely burn this bridge and just ruin our relationship forever? Is there anything at all I can do to try and salvage this? Am I just now an awful person and friend?

Thank you in advance and if you have questions please ask I’ll try to respond.