Girl's Behavior

Why does he keep staring at me and trying to make me jealous, if he says doesn't like me?

Well, there's this guy I really love. We have been in the same class for 2 years. That's how we met each other and how my affection for him started. We've never been exactly friends, but we used to talk a lot to each other. Since he got into a different class. he's been acting strange. he doesn't look at me and he pretends he doesn't know me. He's now popular and has new friends. I've been to shy to stroll to him and talk. After we got separated into different class I also realized my so called affection towards him, was more then that. I began acting strange too. I started to hear people say his name, I saw him everywhere I went, my mind was trying really hard to have him near, so I began to pay more attention to everything that has to do with him. I began to dream about him and started to sweat in front him. My heart raced like crazy, whenever I saw him. He on the other hand continued to live his life and got a girlfriend. I got irritated easily whenever a girl went too close to him. My actions showed how much I loved him and soon enough the whole school was gossiping how I liked him. All the girls that were near him glared at me every time I passed by. His friends began acting strange around me, they would keep looking at me or giggle when he was with them and I passed by. He didn't really care, cause he kept treating me, like he has been all this time, actually, he started to avoid me. I felt lonely, cause I wanted him to comfort me, but nothing happened. I started to lose fate and wanted to give up on him, when something happened. He would wink at me or smile and every time he did that, I got my hopes up, to see them crashing down, when I saw him on the arm of a girl. I started to lose patience and was getting fed up of the situation I was in. I decided to confess to him. I told him how much I loved him, but I got rejected just like that. I again confessed to him, I didn't want to give up, but he always told me he had a girlfriend. I was enraged to hear the same response again and again, so I asked him to tell me straight out; "Do you like me or NOT?" He told me no, that he has never felt anything for me. I naturally gave up on him finely, but now that I started to move on and didn't pay attention any more to what he said or did, he started to stare at me, he began to flirt with every girl when I was around to make me jealous. In the beginning I didn't care, cause his rejection towards me was too vivid, but after a while it started to annoy me and I began to really get jealous. But I also began to ask myself why he did all of that, if he so called 'never felt anything towards me'. I paid attention to every move he did and noticed he kept staring at me only when he was alone or when his friends wasn't looking. I keep trying to understand him, but no matter what I do, he doesn't want to open up to me. It gets hard to understand him and it breaks my heart more then his. I want to know what he's thinking when he's staring at me.
Why does he keep staring at me and trying to make me jealous, if he says doesn't like me?
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