Stares like a creep?

All this guy at my uni does is stare at me when he sees me. No effort to stop or chat. Nothing. Just stare like a creep.
He was there in the library but was still not making himself approachable. I said hello to him and smiled to which he did say hi but why not make yourself available if you stare so much?

Instead, he speaks to those who gossip behind his back (he doesn't know about it though) . I ve started to dislike him a lot especially after I saw him talking to two people especially one girl who basically framed him as a cheater to me.
He talks to them rarely but I hate him now. What should I do? Or am I overreacting?

Should I stop paying attention to him completely?
Stares like a creep?
Post Opinion