Why is there tension between us if he doesn't like me?

Anonymous
So I know for a fact that this guy I have a crush on doesn't like me, he showed it in various ways when I tried to get close to him.. he used to stare at me a lot with a smile and usually got really nervous around me (couldn't look me in the eye for example..) but not anymore.

He's usually talkative around his friends, but I noticed that whenever I'm around he just stops talking and looks a bit uncomfortable, now why is that? Personally, when I don't like someone, I barely notice them and act natural, so why does his behavior change if he doesn't care about me?
Why is there tension between us if he doesn't like me?
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