Since you who have been close to him cannot tell whether he is harmless or not, then it is not possible for us to know.
What about others who know him?
How do people respond to him?
What do your friends, relatives and fellow-students think of him?
I agree that it would be very bad if he got a reputation as an aggressive stalker, when all he wants is to remain friends.
Equally, it would be bad if he harmed you, and you hadn't been prepared to protect yourself.
But do you have any real reason to believe that he could be violent or aggressive?
