I have just been exposed to this Monkey Sphere Theory. I have a theory to add to theirs: that the "monkey sphere" of people on the autism spectrum might be smaller and deeper than that of a neurotypical person. I become inordinately attached to people, seemingly regardless of reciprocation or the degree to which I mean anything to them. In other words, I don't have to be in their monkey-sphere in order for them to be in my smaller one, where each and every person is absolutely precious and irreplaceable. That hurts. I try to protect myself against this sort of thing, but it's never any good.
This doesn't make sense though, because in addition to the immediate of circle of family, friends, etc that I'm attached to, I have a bad habit of developing emotional attachments (I don't mean in a romantic sense, although as we have seen, that's possible as well) to random people. I'm not good at communicating to people that they mean anything to me. I don't know. Maybe it's never going to make any sense.