GF broke up with me, is now in love with my best friend

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We broke up 4 weeks ago. I think it was a good thing, I was desperate and couldn't live without her. But now, she's fallen in love with my best friend of years. I've tried to have nothing change, but whenever we're together, he texts her constantly. He cares about her, and she's been through a lot of shit, but whenever he does, I can't stand it. I want my ex to talk to me, and tell her if I was really bad enough towards the end of the relationship that she doesn't want to speak to me ever again. Or, that we all become friends, and my best friend and her get together. He's a good guy.

I feel like I can't put our relationship behind me until I get pushed away entirely, or accepted back to some degree. I don't want her sex, I just want to talk. Then maybe sex, but meh. I don't love her anymore. If she pushes me away entirely, I feel like I can't be friends with my bro anymore. Yesterday, we hung out, and it was just painful to watch him text her every 20 seconds.

What should I do?