A simpler name for an unrequited love scenario is a "oneitis" - as you know, Adam. It's an especially apt word for Aspies, having their special interests. The special interest could be on a person who's a romantic interest, one person hence the person's a "oneitis", but an unattainable person for whatever reason - e.g. already having a partner, or they're a celebrity. Thus, nick007's special interest in Miranda Cosgrove counted as a oneitis. I have had oneitises in the past. They were very distracting. I have worked on disciplining myself over the past few years to mentally guard myself against oneitis formation, by frank assessment of how attainable a girl is combined with frank assessment my own potential mating value. This disciplining has been quite effective for me, but I used to get oneitises in customer service situations such as with supermarket staff, as they were the main place where any girls were friendly towards me and I had positive interaction with them, hell they were paid to do so! In fact, realising they were paid to do so assuaged much of my whole oneitis problem.
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The greatest kingdom in all the world. All hail Lilliput!