My crush is being nice to me for no reason. Why?

Anonymous
So, my crush is this really nice, kind, funny guy. He's always really friendly whenever I'm around, smiling, laughing etc.
But I don't really know him that well, despite being in a class with him for a couple of years.
I've had about five or six (short, mind) conversations with him.

Once, he randomly offered me his popcorn even though I'd only talked to him like, twice. He said I could have as much as I wanted (I ended up subconsciously eating it all because I was feeling really depressed.)
He also let me have his seat when there was none left.
If he sees me in the car park after school he'll wave and look happy to see me.
At first, I thought I had a pretty good chance, seeing as this was all out of the blue.

But then, he got a girlfriend. My best friend. Beautiful, funny, the richest in our class of middle class kids. I wasn't too jealous. Just a little caught off guard - why would somebody who was, in essence, a total stranger, be so randomly nice to me?
Am I just majorly blowing this out of proportion?
My crush is being nice to me for no reason. Why?
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