I think whether or not your asexuality changes in the end is based on your reasons for being such. I do feel like I was born this way and never made the choice, and that's fine, but I also have reasons to not want it. I would never want to do anything that could ever get me pregnant, for example. So that keeps me away too.
I'm sorry she made you feel that way. ): No one deserves to be treated like that- the subtle little ways of making you feel like *****. Though she probably wasn't doing it on purpose, I know that can still hurt. One of my shortest relationships was with a guy who pushed way too hard and tried to make ME feel like the bad guy when he didn't get what he wanted. Terrible time, cause you never want to disappoint, you know? But I agree, I'd much rather always be single than have to meet someone and explain why I don't want to have sex and all the other things I have going on. It's alright if they bail at first, but once they convince you it's fine and you get attached, and then they bail, that's much worse.
Thanks for the luck, too!
(Ah, that's nice of you, thanks!)