Does he like me or just being nice?

So there is this guy that I have know since a little girl but didn’t put much attention until his sister said that he used to have a crush on me, and I used to have a crush on him too. We hang out for three days at a place and he would talk too a lot of girl bc he says they are easy to talk to but when it comes to me he just doesn’t talk when he sees me he smiles or smile and wave but that’s it. Also I’ve caught him a bunch of times looking at my direction and when I would look at him looking at my direction he would look away and when we talked one time with a group I would smile and not talk but he would look at me and have a big smile too so I’m so confused what’s going on.

Does he like me or just being nice?
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