A strange guy! why does he do that?

That could be coicidence but is becoming quite usual: i know a guy but only on line for 2 years now. we talk sometimes, we see each other on webcam sometimes..he is very nice! but everythime i come online on msn, he comes at the same time! i think he stays offline(invisible), but i tryed to log in and log off just to see if i was right! and bingo!! he logs in when i log in! people may say he is a physcho, but i know he is not.. anyway, why does he do that! i try to talk to him but he doesn't even reply.. so strange isn't it?