Why does he stare at me, with and without his friends when I'm around? Even though I rejected him out of fear? It makes me uncomfortable?

So there is this guy, I really liked. 2 years ago my friend texted him on dm and asked if he liked me and he said he didn't. Now I don't feel anything for him.

He heard almost a year ago from people I liked him (which was true and not true) so he asked me if it was true on dm. I said "maybe (it's too stupid to say I know) but I can't really say that because I don't know you personally". He said really simple a "ohw" and after some he blocked me. Now here is the thing. I moved on because I don't know what to do after and that he blocked me was a sign for me that I should leave it.

Since then until now he's still staring at me. Every time he stares at me when i walk past him to head to my class until I'm out of sight. Every time he lookes into my eyes and holds it until I look away. Now I look always away first cuz I get really nervous from it all. So nervous I sometimes can't even look at him. Every time if his friends are with him they stare at me too. He doesn't smile or anything. Nothing. His friends do the same. I once heard from someone that he (the guy I'm talking about) once told him that he sees potential in me... I don't know what that means?

I'm not confident enough to talk to him or ask him that and it's a while ago and I don't want to bring this whole thing up again.

Some say he likes me but I don't know that. I mean he kind of rejected me in the first place. Second I did because I'm scared to let someone in you know. For a relationship. I never had one and I didn't know what side he wanted too with this. Later he said he "just wanted to know it".

I know I was/am a jerk because I rejected him and wasn't honest with my feelings to him but I feel like we both were. And I think that's the reason why we crashed.

I want to know your opinion on this! I'm open for all!
Why does he stare at me, with and without his friends when I'm around? Even though I rejected him out of fear? It makes me uncomfortable?
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