How do I help my brother process his recent breakup?

Hi all. As the title says, this is about getting advice for my brother and not about boyfriend problems. My bro lives across the country and was dating a woman for 10 months. I never met her due to distance but I’ve talked to her on Facebook and I love her. Apparently she got diagnosed with autism at a young age though and that contributed to their breakup. On top of that, my brother is a severe perfectionist with a bad temper when things don’t go exactly to plan.

So he takes her out for her birthday and she has to take a train to NYC (we live in the suburbs) to meet him. She misses the train and he flips the fuck out and starts screaming at her. This continues (according to him) the rest of the day, I ask what’s wrong and he just curses her out. I see it’s really bugging him so then I asked her and she told me what happened, saying my bro was probably mad because she sent him a letter saying “I’m done with your put downs! You have a dead end job that with no benefits, pension or decent salary” and saying “I hope you find another woman who is willing to overlook that”. (My bro is 43 and does work a dead end job). From what she says, he screamed at her, got angry with her to the point she cried on the date and dumped her. About a week later, he gets a letter from her saying “I don’t want you back” and telling everything wrong with him and why she wasn’t capable of living alone so she took it back to him about his job. Now all I hear from my brother is that fucking bitch etc and he can’t understand why she doesn’t want to know what she’s doin. I think it’s his ego. How do I get him to realize he’s a big part of his healing. I’ve told him that’s probably why and he denies How do I get him to do realize this. She sent him a letter telling him everything wrong with him ( which was spot on no offense) including the dead end job. All he does is bitch about what she said to him and how angry he is. I think he has unresolved feelings for her. Help

Updates
11 mo
He says “fuck her” and that it doesn’t bother him but the breakup happened a month ago and she sent him the nasty goodbye message two weeks ago. He’s still sulking about what she said about him even though it’s been two weeks. I think he still wants her and won’t acknowledge it.
Updates
11 mo
One other thing I forgot to add was that my brother is angry that she bashed his job, but he also made fun of her autism ( from what she told me) and the fact that she can’t afford to live by herself.
How do I help my brother process his recent breakup?
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