The first girl I told, I had been dating for about a year or so, and I had just found out about AS. She didn't really agree that I had it when I first told her about it, but after she learned a lot more about it, she's pretty convinced I have it...and she thinks I have it more severely than I think I do
I told two of my exes after that...one of them flat out did not believe me, and seemed rather offended...the second one said she could see it, and kind of felt like she could relate to a lot of the traits. After the first reaction, I decided I needed to be much more selective in who I told.
Then I told this one girl I was kind of seeing, she didn't believe me at all and thought I was just being weird. I had a feeling before that I shouldn't have told her, and I was correct =/ But we only went out for a couple days anyway, so it doesn't really matter.
The current girl, we were into a heavy discussion about a related topic...I kind of wanted to tell her, but I felt like it was way too early, but she dragged it out of me. I said "Okay...have you ever heard of Aspergers Syndrome?" and she said that she had, and that she'd been unofficially diagnosed with it when she was a teen. If only it were always that easy 
_________________
I'll brave the storm to come, for it surely looks like rain...