Is OTHER wrong in the post ? POST : Submitting here because this is just a baffling situation to me, and I could use some help figuring out what, if anything, I did to earn the asshole title. 

Right. Rooming with a very good female friend for four months now. It's a pretty ideal living situation, both in terms of the place itself and how we get along as roomies. Both considerate and good at sharing space. We've known each other for two years now and are very comfortable together. I'd suspected that maybe right at the start of our friendship that she had some feelings for me, but we've been platonic buddies since then. I do still think she is quite physically attractive, although the idea of romance has long been closed off in my brain.

Well: it's wicked cold last night, so we decide to stay in. Snuggled up on the couch with drinks and such. The movie ends and we're chatting, and, it happens - we start kissing. To the best of my knowledge it was a mutual-initiation thing; I don't know whose idea it was but I was very into her in that moment, and obviously she was into me. We ended up having sex. 

"Awkward" doesn't begin to describe the state of things at the moment - in truth, she's really very angry with me. Apparently I've ruined absolutely everything. She thinks we can't live together anymore - that not only has the friendship been tainted, but we can't possibly share a living space now that we've had a sexual relationship. 

I mean... I'm just incredibly confused, and can't really see why she's framing me as such a douche right now. Sure I could have stopped it from happening, but we were both into it, and I don't see why things have changed so drastically from 24 hours ago. If we feel like pursuing a relationship, we can; if not, that's fine, we can keep living together normally. It feels strange to say because I don't bear her any ill will in general, but right now I think she's being a bit of an asshole about it. At any rate I don't think I am. Granted if she's intent on kicking me out, obviously I'll go. And I certainly don't want to pick this hill to die on if I'm in fact a giant asshole whose too blind to see it. 

AITA?