Flirting

Is it normal to think of someone you barely know all the time?

So there's a guy that I met through his job. I don't know much about him at all, other than his name. I feel a connection every time we talk. Here are some examples as to why I think he does like me: Every time he sees my car (through the drive through window), he'll do a double take to make sure its me, and he'll make a point to come to the window, wave, and smile at me. He than will come to the window and Our eyes will just lock onto each other, and we'll have basic conversation like "hi, how are you." There was another time I went through and he asked me if his eye was still swollen, making it a point for me to look into his eyes. Also, I work in the same profession as him, so he'll try to relate to me through our jobs. Well one day I decided to be brave, and I handed him my number on a piece of paper, He smiled at me and I drove away. I never received a call or text. Now I had went back through a week later, and he explained to me that it wasn't that he didn't want to call me, but that he probably shouldn't call me because he has a girlfriend. I told him I respected that. He handed me my food, smiled big at me and said "I'll see you around" and I did the same and drove away. I do not want to keep going up to his work because I do not want to seem like a stalker or anything, so I haven't gone up there since he told me he had a girlfriend. But now I can't seem to get him out of my head. I know that his job is the only place I'll be able to see or speak to him, and I really do want to get to know him better. Even though I know he has a girlfriend and I know its not right at all. Part of me just wants to stick around and that he'll know I'm here if they ever break up. I've even had a dream about him. I don't know if I'm crazy or if this happens often with other people. I have never had this happen before. Any thoughts?
Is it normal to think of someone you barely know all the time?
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