I hoped to imply that with my 1 line post earlier…it could be that this guy simply doesn’t understand how to approach someone. Completely rejecting him might not be the best course of action for him…Of course, it would be a moot point if you don’t care about his wellbeing.
(I thought about how to phrase that and that was the best I could come up with…I don’t mean it to sound like a guilt-trip)
Just to reiterate what others have said: if he crosses certain lines multiple times (or even once), it could be time to get parents/school involved.