Guys, Men is this normal?

There is a guy in my year and I added him on snapchat back in like September as I saw him on quick add. We got talking but he would and still does leave me on sent for ages but if I do that he questions me?

He won’t talk to me with other people around. He spoke to me once the other day about a school subject with his friend there and that’s the first time ever another person has been with either of us while talking.

I often find him looking at me when I’m in my base classroom and I mean dead on looking at me and doesn’t even try deny it. The other day I was doing study and he stayed in front of the window, waiting for me to see him so he could wave?

his actions seem very strange to me. Sometimes he says hello and is polite and other times I don’t exist to him? Like whats he playing at?
Guys, Men is this normal?
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