Is he interested or what?

Recently, I started with a swimming routine in a place near where I live. The thing is that there's a guy –when he's on duty– who always stares at me —and smiles— when I'm swimming, but also when I get out/enter the dressing room. I don't know if he's interested in me or what, I'm a little confused about his behavior.

We haven't talked much, just the important things about the swimming pool's rules –but he's kind and funny when he talks to me–.

What do you think about it?

Is he interested or what?
Is he interested or what?
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