Guy is obsessed with me...?

Im on AIM and talking to this guy. We're just friends. I am 21 and he is 19. We never see each other, we had a cl togehter once and thats it. He continually talks to me online as soon as i sign on and asks me stupid questions that dont matter, like how many cles are you taking, what time did you go home today, i thought i saw u today but it was someone else. I also have a FWB who calls me every single day and keeps asking me who im with even though he swears were just fwb. There are maybe 2 or 3 more who have stuck around for a few years. Dont get me wrong, I have been obsessed with a guy once or twice, but never to this extent where when i kept talking and talking for years! Are they obsessed with me? I dont mean it in a conceited way, beause i have been obs w guys who werent all that. I feel like guys (and girls) get obsessed so easy when the other person doesn't care! Is this the general rule?