Some people want what they can't have. Some only want what they can't have, and would be quite devastated if they actually had it.
But yeah, there's perhaps not being 'too much' - say, letting a dating experience settle and getting a little distance and persepective on it - and there's plain not showing any interest.
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Of course, it's probably quite a bit more complicated than that.
You know sometimes, between the dames and the horses, I don't even know why I put my hat on.