This requires a bit of backstory, as this seems to be turning into some sort of multi-year saga now…
About 8 or so years ago I attended a HS friend’s wedding three states away. Got to see and hang out with some friends I hadn’t seen in a while, I had fun, then went home and thought nothing more of it.
A couple weeks later said friend emails me to tell me a friend of hers (from said state hundreds of miles away) had been quite taken with me and was asking her to put us in touch. Not, you understand, so taken that he’d actually introduced himself, talked to me at all, or otherwise made himself known to me in any fashion when we were in the same room at the reception. I had no idea who this guy was, so my reaction was pretty much “I have no idea who this guy is, but sure, whatever,” figuring it would be relatively harmless.
As it turns out, this guy is, to put it kindly, seriously whack. He was smitten with me, although what he wanted me to do about that I didn’t know, because I sure as hell had no plans to move out-of-state anytime soon (and I still had absolutely no idea what he even looked like). At the same time (and I’m fuzzy on the details, since it was ages ago and I haven’t thought of him in years), he apparently had a girlfriend who he was also very smitten with. Except she was Japanese and returning home soon, and in our IM chats made it clear that she was pretty much of the notion that their relationship would be over once she left the country. So I (kindly, I thought) said I was sorry that he would be losing someone he obviously cared about a great deal. Whereupon he had a complete, vicious meltdown about how DARE I say that his relationship had no chance and was all but over – even though he’d said it first. At that point, I’m figuratively backing away slowly, and never contacted him again. Thankfully, he left me alone for years after that.
Maybe a year or two ago, I got a friend request from him. I think it mighty strange, given how livid he was at me the last time we spoke. I figured that he’d just signed up for Facebook and had used the friend finder feature, and had forgotten to remove me from his address book (which I knew, I’d received some junk/glurge mass emails from him a couple times, which I’d just deleted without comment), and then didn’t bother to double check who he was sending requests to. So I ignore it.
Which would be the end of the story, except just a couple days ago, he sent me a MESSAGE on FB saying basically, “Hey, remember me?” Uh, what? First of all, I still have no idea what he even looks like (his profile photo is of a parrot). I’ve never met him in person, and our last contact was him losing his shit on me. I’ve debated sending a reply message just saying “Look, last time we spoke you made it clear you wanted nothing to do with me, and I think that’s where we should leave it.” But I’d guess that would just result in another melt-down (whereupon he’ll want to reconnect again in another 5 years). Sigh.
I have no idea if this guy is just that seriously co-dependent, or what. I’m continuing to ignore him, because good lord I wouldn’t touch that kind of drama queen with a ten-foot pole.
I don’t know what it is about my HS friend (the one who’s wedding it was) – a lot of her friends seem to be really off-kilter. Her (now ex-) husband’s cousin met me at the reception, too, and similarly became infatuated with me, and similarly lived some 300-odd miles away from me. He emailed me a few times afterwards, where he made it clear that he thought I would just drop my entire life to pick up and move so he could support me, or whatever. After having met him all of once, briefly. I asked what on earth made him think that I’d want to do that, and he seemed shocked that it wasn’t self-evident. 
He really tried to pour on the charm; which left me all WTF because it was fairly obvious that the logistics were a non-starter.
