maybe he's shy

LOL, FYL I'd probably be like that if I saw a hot girl get on the bus

UGLY!Dx

maybe he thought you were way to hot for him to sit next to. I do the same thing all the time

If you were too fat, too ugly or too old he would have set next you, trust me I ride the bus every day to work

Learn a little body language. If I'm not in a particular need of sitting down, and I feel that the person that I would be sitting down would be umconfortable with me, and I feel like, well, I can stand the rest of the way, then I don't inconvenience them. I always try to just sit at the back anyways; but if I'm tired or going on a longer trip, I'll sit anywhere, next to anyone. It's just a goddamned bus trip anyways, don't read too much into it. Next time keep smiling and looking at him. I don't know why the hell so many American women have forgotten how to flirt. Outside of the US it's harder to hook up, but when a woman wants to hook up with you, you know it sooner and more easily.

maybe he tought you were attractive and was too shy to sit next to you...

Ouch! That's gotta hurt the 'ole ego!!

Happens to me all the time

You do realise that he could have just been to nerves to sit next to you.