Stalker?????????????

w do i know if a guy likes me ??? and how do i get a guy to come to me like :? lol okay .... well there is this guy and he's in my art cl and in the 1st week of school i heard him asking who i was and other things then he like sometime looks at me and like where i stand in art he does like right behind me and if i see him in the hallway he'll slow down like waiting for me to walk next to him.... but he never talked to me but talked to my best friend( she knows i like him) and he also started to talk to my sister best friend! like i dont get him and i see him everywhere like i feel like a stalker but i dont do anything is he one? ooo and if he sees me he'll like get close and walk away.... and he'll go out of his way to walk right in front of me.. and i use to sit at a table in my art cl and moved to a different one and he sat there.