My moh just quit on me

Sounds like she doesn't know how to deal with her hurt and is taking it out on you. I would let her cool down, then ask her in a month or so if she still doesn't want to be MOH. The break up is still fresh and though she might not care about walking down the aisle with an ex in 2 years, with a tender heart right now she does. Let her process in her own way and don't push her, you still have plenty of time to get this all sorted out.

This sounds messy and very similar to my story!
One of our friends couple (BM and GM) announced they were divorcing shortly after we asked them to be part of our bridal party. At first it was amicable and they exchange words during engagement party and we told them we would accommodate them to not walk together and so on. They were thrill to still be a part of it until things got messy after he started dating someone. He actually came over and said he no longer wanted to be part of our wedding party or attend. My husband try to reason with him to at least attend because they have being friends for years but he wouldn’t vouch. He just went MIA after that and never spoke to us again. Her on the other side stick by my side and even thought we met her thru him we are grateful to still have such a great relationship with her. We realize he wasn’t a true friend in the end because it wasn’t fair after so many years of friendship.
Sometimes you need this to open your eyes and that’s what we got from this. Is sad but is life.

View Quoted Comment That’s my thinking. I get she’s upset but this isn’t even a divorce they just dated casually for a few months like sure we all joked about them getting married too and us being sisters for real but it really was only a few months and if you’re going to let that get in the way of supporting your best friend in her wedding day then really you’re not a very good friend.

I would give her a little time to get past this. I agree that it’s an overreaction, but as devils advocate, maybe she thought it was the real deal. And I mean, what girl doesn’t love the idea of marrying the brother of her besties husband? It’s like a teen drama coming true. It may hurt a little more since you are getting married and here she is single, again. I’m not saying she should be acting this way, just that it may be a little understandable. So I wouldn’t cross her off your bridesmaid list yet. Give her a little time to cool off and see how she feels. If it’s still an issue, maybe have the bridal party walk in/out single file. Maybe that would make her more agreeable until she realizes how obnoxious she’s behaving. However if she continues to act like the world is over, let her walk.

It's unfortunate, but this is why it's so important to wait until closer to the wedding to choose your bridal party. Had this happened without the wedding being involved, it probably would have blown over within a few days. Now that she has the wedding to throw in your face, it's going to be a bigger ordeal. Like PPs said, she'll probably get over herself and regret it soon, however, I would be hesitant to let someone back in my BP who is going to drop out every time they have a bad day.

She does sound hurt. Would it be ok if she just walks with someone else?

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Yep! She made her choice and now she has to live with it. A true friend would not do this, this is your wedding day, not some random event. She’s being selfish. I know breakups are rough, but honestly, it was a few months.