He'd mention my name out of the blue. I was friends with his friends, and they would tell me that he'd always say my name out of the blue whenever they'd hang out. This proved to me that if he could have a smirk whenever he'd hear my name, and that if he cannot shut up about me, it's for a pretty good reason.
He gave me all the positive body language. This means no slouching, crossing of the arms, or hands in pocket kind of thing. He'd have a good posture, open legs, and when I'd talk he'd have his head tilted, and nodding every now and then to show me he was listening.
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He would constantly be touching his hair, arms, and shirt. He would try and fix his hair. He didn't think I'd notice, but I did. He would try to make himself appear bigger, and he'd be touching his muscular arms at me. He would straighten his shirt, or wipe off any little thing he'd see in his shirt. From what I know, this just meant he was trying to look his best to the person he's interested in.
He'd say yes to things I'd ask him to do. Not angrily saying yes, but happily. One time, I asked him to come with me to go walk another guy home. I thought i would have to beg, and trust me I was getting ready to do so, but in an instant he said yes while smiling at the same time.
He would pay attention to me. He would see me, and say hi. He would go out of his way to go look for me, and was even willing to take some of his time to even help me do the laundry.
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So these things happened between him and I. Of course, at the end, it all comes down to that moment that you first kiss. And when you kiss, you just know if he's the guy for you, and if there's a chance this is something deep. I can't define it, but you'll know once it happens to you. I do put forward that crossing the line to become more than friends can damage the friendship. You have to know that my best guy friend and I don't speak anymore, although we do still hold strong feelings for each other. It may not always work out, but it makes memories. :)