How do I know when a guy likes me?

I'm only 13 years old but I've really liked this guy ever since I was around 9. I can see both his pros and cons, so I just think I like him a bit more than a simple crush. Since I am only 13, I am not planning on confessing anytime soon, although I'm really curious if he likes me back. What signs should I look for? I don't mean just the basic "eye contact" or "body direction" I mean like specific things I could look out for.
Here's how he is like
- apologetic
- plays the violin
- Chinese
- clumsy
- quiet
- likes hotpot
- really likes his dog
- extremely straightforward
How do I know when a guy likes me?
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