Straight Men of GAG: What's the most annoying thing you can find out about a girl you like?

You fall for a girl, only to realize she's queer/"bi"/lesbo/not-hetero and polyamorous.
You fall for a girl, who's been receptive to you and touchy the whole time, only to find out she has a partner/is married (and monogamous/faithful).
You fall for a girl, only to realize they're a MtF transperson who 95% passes as a female (looks and sounds like an actual woman, for the most part).
You fall for a girl, only to realize she's a pathological/compulsive liar and probably psycho (but hides it well).
None of these would bother me: I would happily date a lesbian, married woman, transwoman, or psychopath.
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You fall for a girl, only to realize she's a single mother with kids (none of them ever had a father in their life).
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Straight Men of GAG: What's the most annoying thing you can find out about a girl you like?
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