it means that he is being friendly
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.
when a guy "struts" it just means that he walks or gracefully walks in front of 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
He wasn't watching where he was going
Many young men are shy so if you wave 'hi' he feels more comfortable and that is why he walking you to class. He may well be interested in you. If you like him then ask him if he would like to join you one night for a movie.
It mean he trippin'.
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.
If a guy walks around you, it could simply mean that he is trying to get around you in a crowded space. However, if he repeatedly circles around you or seems to be following you, it may suggest that he is interested in you or trying to catch your attention.
He likes you
Boys talk about me in class becase i am the mlst popular girl in my class and i have a crush on a boy called nicolas
hes trying to get your attention or hes just walking beside you
if he literally drools when you walk by, then i suggest making a b-line for the door, 'cause that guy has issues.