I'm normal enough at first glance, but anyone who knows me to the point of being in a relationship (assumes a certain knowledge of my personality and history is required for a romantic relationship with me) will probably have guessed by now. Plus I hate keeping secrets. Of course, unless they ask me beforehand, I usually wait until some kind of steady relationship has been established before letting the secret out. The three relationships I've had thus far have all been like this, and each time my other half at the time has said something along the lines of "I guessed as much because of X, but what the hell you're still a nice guy." Kyuuchan of course is no exception. In fact between her and my two exes she's been the most accepting of my shortcomings as an Aspie, a boyfriend, and a person in general.
Personally, anyone not understanding enough to accept this fact after establishing a relationship with me or another autistic individual isn't understanding enough to BE in said relationship. Of course, timing is key if you plan to reveal the information yourself, but unless they A) Already know, B) Guessed but didn't know for sure, or C) Had no clue but accepts it and says it doesn't matter to them, I'd break up now, because whatever relationship you DO have with such a person will end quickly - and it will NOT end well.
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"Yeah, so this one time, I tried playing poker with tarot cards... got a full house, and about four people died." ~ Unknown comedian
Happy New Year from WP's resident fortune-teller! May the cards be ever in your favor.