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It's okay to ask. We're all people in here (though it's RMN btw).

As much as you would like to intervene, stay above it. You may think that it's good to fight back, but it's not entirely a good idea all the same. It would hurt even further by the fact that it is someone you were close to, someone you have known for a long time.

It will fight back and a good idea is steer away from it. You have so much to do, especially in this community that still asks for your greatest input. It will use your actions against you, but being above it is better than none. It's like the tendency of having a bully, but this time it's your closest ally putting you to little pieces.

It will wear off soon. Plus, you would also see a little truth as to why you were betrayed in the first place. They do these acts if they are in a current state of emotion that would do such act or something that compels them to do such act. Well, unless said person is really interested in putting you down for good.

I agree with the sentiment.
Usually it has to do with emotions rising up from elsewhere - not related to you, but just coming up in that moment.

Take a step back, take good care of yourself, and then feel it through and see what it's all about.

It's okay for something to go wrong - and it's good to talk about it (sometimes you really just do need to get your feelings out and voiced, that's healthy), but it won't really work out if you have no way of forgiving it or seeing the bigger picture with it. Just because they weren't kind to us that day, doesn't mean they can't be kind people. That kind of thing. Emotions change, mistakes happen, but one is more than that. And I am sure you are valued and that value stayed with you.
Which is where the "take a step back and take good care of your emotions" comes in. Usually those are moments where you also learn so much about yourself and others.

It's actually the closest ones to us who can hurt us the most because of that closeness - but usually it really isn't mean to be any such pain. Which is the frustrating part of it all. Sometimes things DO change, or people are in a different place or need different things (we all go at a different pace anyway), maybe you need to step back a little and be not as close as you were, but maybe not *shrug*
Many times it can simply be misunderstandings or miscommunications (and feeling hurt is OKAY and ALLOWED) it just means you can learn how to do better next time.

What it does show is where and how we hurt or have been hurt and are scared or angry with and how. And .. it may sound silly but it is easy to trust people when nothing ever went wrong. It's easy to feel safe then, but knowing you are allowed to feel safe even when something happened before, takes a lot more, but it also goes a lot deeper. I don't know exactly what happened, but you choose what you would like to be here. And what course of action you will take. Remember that power.

Good luck dear : )
All the best to you.

Edit: Oh, and you are totally free to ask! We do need to get things off our chest : ) And if you need something more, then it's really good to reach out and get that "something more". Be that advice, a hug, or something else.

I agree with what Ky and Hiroshi have said.

In the end, all you really can do is cry as much as you need to, move on, and don't forget that there are still people who care and are there for you.