You've got to spread it around a little! Maybe try befriending that person's other friends. It can be nice to be one of a group of 3 or 4, and puts things in perspective so you don't cling. In case you don't know how to befriend these people, try initiating conversation that's about them (and not your special interest). Be interested-- don't just act like it, as we Aspies usually turn out to be terrible liars. However, all of this might turn out to be too tricky and complicated if your original friend isn't aware of your ASD, as he/she can sort of introduce the concept to the others and let them know you are ok.
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What doesn't kill us only makes us stronger