Does he like me? Or is he just leading me on?

This guy is sooo confusing! I've liked him for about a year now, on and off. He looks at me in the hallways at school one day and then the next day, he'll act like I don't exist. I don't look at him because I'm always so nervous around him and think I'd look like an idiot if he saw me. He'll look in from the hallway at me in my cles about every other day, and he even smiled twice, but I was so nervous and shocked that I didn't return the smile. I catch his friends looking at me sometimes, although they never say much to me. Last year, he'd wait around at his locker until I started ping him so he could walk next to me, yet he NEVER talks to me first. I'm always the one to do it. I asked him once what he thought about me and when I asked him if we were just friends he said "yeah." Yet, every time I try to get over him, he always does something that makes me wonder if he was telling the truth. We had some cles before together and he was always so nice. He even once told his friend, who was making fun of me for being a vegetarian, that he was being cruel. His friend also made fun of my laugh once, and I'm not exactly sure if he said anything, but he started speking to his friend very quietly. He laughed at my corny jokes when we spoke rarely in the halls. I bet I have been confusing, too, with all the guy friends I have, but I suspect that if he thought I liked one of them, that I would've acted on that by now. Also, I've tried to contact him online because I'm too shy to do it in person, but he never returns my comments. He once asked me if i would want to hang out with him sometime and he even gave me his phone number, but I for some reason didn't get that comment he left, and only saw it 2 weeks later while checking my E-mails. I told him that I did want to hang out with him, but when I tried to make plans, he had an excuse, both times. So i told him that he should make the plans next time, but he hasn't yet. I don't know what to do. I'm not self-confident enough to flirt with him or make a move because we don't have any cles. So, is there anything I can do to subtly let him know I like him enough and want him to make a move, or should I not even bother?