What can I do? I feel betrayed by my best friend?

My best friend has started hanging out with my crush, with whom he was not friends before.

During 2 years, I had confessed several times my feelings to my crush, and got rejected. She was aware of my feelings for her. During all that time, I was talking to my friend about every detail of my love for my crush. He was a witness to the worst period of my life, he was witnessing all that suffering I was feeling. I had called him in every possible state of mind, even once when I was drunk and crying on the floor, unable to hold all that pain.

Finally, some months ago, after so many times that I got rejected, I finally felt strong enough to move on and I got a girlfriend, but without having surpassed yet my feelings for my crush (which I informed my girlfriend about, because I wanted to be correct towards her). For a long time in my relationship, I had still unresolved feelings for that crush and my best friend was the one I was talking about that to.

Then, suddenly, I found out that he was making steps to approach her and some days ago they started hanging out, the posted it on their social media, and he even texted me to tell me how great time they had together.

I feel betrayed, because my friend violated the Bro - Code so badly. I don't care so much about her (she knew that he is my best friend, and I feel like she knew that this would cause me a lot of pain, and for me this is a huge red flag)

What can I do? I feel betrayed by my best friend?
Post Opinion