What are some common signs a guy likes you?

I like a guy at my school, but I don't know if he's into me. I think he might be, but I'm unsure. He talks to me whenever he sees me in the halls, he's always smiling, he always looks me in the eyes when I'm talking to him, and he's really fun to be around. We've never really hung out much outside of the religious group we're both in, but I'm hoping to hang out with him this summer once he gets back from his mission trip. I think he may like me, but I've been wrong about this before. What are some other signs that a guy likes a girl? Is he just being friendly? I appreciate any responses!

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