How to let a guy know it's okay to come up and talk to you?

Anonymous
This guy talked to me and asked me questions and really listened to what I had to say (which made me feel good) and flirted with me one time we had to do a project together. Ever since then he always stares at me. He doesn't really come up to me and talk to me though. BUT he's always checking me out and stuff. I THINK he is attracted to me but I think I may have accidentally sent him negative vibes.
So how do I signal that it is okay to talk to me?
Updates:
+1 y
Any other opinions? :)
+1 y
It's just so weird that there's a possibility that a guy actually cares about me... Cause no guy ever likes me
+1 y
He CONTINUES to stare
How to let a guy know it's okay to come up and talk to you?
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