My two cents. Maybe there are some issues going on here. Maybe there aren't. But it's not anybody's place (including mine) to play armchair psychologist, and some of the posts here, I feel, are bordering on cruel in a way that's not useful to anyone.
If you think he's obsessed, ignore it.
If you think he's weird, ignore it.
If you think he's posting too much, ignore it.
If you think his posts are done for attention, ignore it.
In short, ignore it. Go to other threads you feel better about. But we can't fix anyone here, and berating him won't help - as much as I understand the frustrations and concerns here. Again, my opinion.