I recently went on my first date in about 3 years. I never intended it to be my only date with this girl, but I had to have that first one be pretty safe because I knew I'd be a bundle of nerves. The only real goal I had for that date was to get through it without embarrassing myself, hopefully have good conversation and get to know her as a friend, and get this particular monkey off my back. I didn't do anything physical or even remotely flirty or romantic mainly because I was too nervous, and as a result, it probably killed any shot at a relationship there may have been. I was further distracted by the fact my mother was seriously ill that day. I didn't really intend to have a "practice date", but that's kind of how it ended up because of the circumstances.
Are you sure the girl isn't an aspie? That's a very blunt and direct thing to say. I don't think I can recall ever having heard of a girl saying to a guy that he was practice. It happens, but it's usually not so directly stated. If this happened to me, I might be disappointed if I was really into this girl, but I'd still respect and appreciate the honesty, since I'd at least have a clear idea where I stood and what was going on without having to try to interpret the usual fake reasons people give like "not ready for a relationship", "it's not you it's me", etc. I say count your blessings that she was straight with you. Some girls would string you along just to have a back-up guy, and those are the ones who I dislike most.
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Self-Diagnosed Dec. 2010
135 Aspie, 65 NT--Aspie Quiz
AQ 40
BAPD--124 aloof, 88 rigid, 83 pragmatic
EQ/SQ--21/78--Extreme systematizing