As an ineligible bachelor, I have discussed this in detail with my friends, and I've come to three independent (but not mutually exclusive) explanations. Note: feel free to expand/condemn any or all of these. 1. People are interested in others that are already in a relationship, as this demonstrates attractiveness and eligibility for further relationships. 2. Because of the fact that you (presumably) aren't vested in sexually-motivated interactions with others, you subconsciously "play it cool", coming off as genuine and thus someone to be desired. 3. Some people just want to fuck up a good thing. There's other contributing factors to be sure (post them in response, Hubski!), but these are some of the most significant that I've seen in action.Also, now that I'm not looking for anything at all, I'm getting hit on. I DO NOT GET HIT ON. I KNOW IT'S AN OLD, OVER USED TROPE, BUT WHERE WERE THESE GIRLS WHEN I WAS SINGLE?