Why would a guy act nervous around a girl?

Okay, I'm trying to figure out why this guy (friend/acquaintance) STILL acts weird/nervous/shy around me!

Okay, long story short, I did like this guy friend of mine 2 years ago. I have never really known how he feels about me, but I think he pretty much sensed that I liked him. Well, turns out that he likes another girl, and they're REALLY close, so I ended up trying to keep my distance. But he has never really let me keep my distance.

-He'll call/text me out of the blue some days to invite me places

-I'll catch him staring at me SOMETIMES from across the room

-If he's near me and talking to someone else, he'll be facing in my direction

-He'll get jealous/or get quiet or moody if another guy is talking/flirting with me

BUT! Sometimes I just sense this general uneasiness around him! Like he won't be able to be completely himself! Our interactions are weird.nervous/shy. I'm wondering if maybe he's trying to give me the hint that he's not interested! Suppose he's trying to give me the hint that he's interested in the other girl, and that I should just leave him alone?

Would a guy act nervous around a girl if he's not interested in her? In other words, would the guy feel uncomfortable/shy around her if he senses that she likes him, but he doesn't feel the same way? I'm just wondering. It's so weird how we interact. Sometimes he'll come say something to me, but he'll be acting nervous, and will say his little convo, and then he will leave the room. It's just strange. Other times, he'll just tease me/ or say some smart remark towards me.

I'm really confused. :-/ Please, I need some feed back from guys and girls, because I don't know what to make of it.
Why would a guy act nervous around a girl?
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