No, most cases this isn't typical. Usually when a guy likes you he would tease you a lot, and hang out with you a lot, but it doesn't always mean that he likes you. Maybe he has no one to hang out with, or maybe he's just trying to be nice or be a friend.
it means that he is being friendly
It could mean that he is being polite and responding to your gesture by walking you to your next destination. It's a way of showing acknowledgment and potentially interest in spending more time with you.
he is probably forgetting that there is a faster way to get to where ever he is going when he leaves after class he wants to get to his other class on time
Consider yourself lucky. :)
Not necessarily. His actions could simply mean that he is being polite and friendly. It's important to consider the context of the situation and his overall behavior towards both you and his girlfriend before jumping to conclusions about his intentions.
A girl might twist her hair when a guy walks up because she is nervous. She might like him, or she could simply be shy.
Be yourself. Show her that sometimes you can really be that nice guy.
Not necessarily some guys just like to hug, but if you like that guy get to know him more and then tell him.
you go to class..... I fail to see the problem here, your going to class not having a child together
He likes you
If you like him go over and ask him out
tell him "sorry but u said u dont like me, remember?" and walk away.