Is it normal that this boy is flirting with me all of a sudden?

Its a long story. So 2 years ago I met this guy who was in my drawing class. He was so cute, and so friendly. And really funny. So I started talking to him occasionally. By Halloween that year, I knew I had a huge crush on him. So that night, we texted for hours and it was beautiful. The next night, I had a terrible cough and without thinking, downed the whole bottle of codeine cough syrup. For me, this amplified my feelings for him (to the point where it was so overwhelming my finger started tingling.) that night I learned something really sad about him that I could completely relate to. So then I was up all night tripping, and couldn't stop thinking about him.
The next day at school, my pupils were still blown completely. I walked around looking crazy. Then in class he walked up to me and started talking to me about one of my drawings. Said he loved it. I was still looking all crazy after the night I had. Later I noticed he was staring intently at me. So weeks pass and I really get to know him. Hung out a few times, one of which was at Starbucks, and still to this day I believe it was a date. He'd say otherwise though. But everything was amazing. Also, the most serendipitous things started happening. I truly felt like he was placed in my life for a specific purpose. I found out later he was hurting deeply. Before I even knew anything about him, I somehow sensed it and did everything in my power to be a light to him and make him happy. One specific day, my Human Experience Professor looked at me and said "you know, I just really see a light in you. You just seem to glow." I didn't think much of it, but as I was walking out of that class, the sun was shining perfectly thru the window onto me. All I could see was black silhouettes walking in the halls. Except for one, I somehow sensed it was this boy. He wrapped his arms around me and I promise you it was the most amazing thing I've ever felt. Especially after what my professor had said minutes earlier.

Weeks later, I admitted to him that I had feelings for him. First time id ever said it in person. Before I could even process what I had just said, he softly said "I think we should be friends. I'm just not sure what I'm looking for. You're really cute though." He walked me to my car and gave me the longest hug ever. Somehow I miraculously held back tears until I got into my car, and then they just poured out. After that, we got a lot closer.

Until the next semester started. He started flirting with this other chick and barely talked to me. My god you have no clue how upset I was. It was just so abrupt. Eventually I got over it for a while and dated some other people. It was a nightmare. So the following semester, I found myself still having feelings for him. It was pathetic. I'd see him on campus and if he didn't see me or wave at me, I'd start crying. Then I really f'ed it up and wrote him a god awful 3 page love letter. Taped it to his locker. 2 weeks later he said he read it and honestly had a bit of an attitude when he said "I still think we should be friends." After that, I really said f** it and moved on. Another friend told me he had been sleeping with literally every girl at our school. Everyone else padded my feelings and said he wouldn't do that. Admittedly I lost respect for him.

So a few months ago, he finds out I moved on and was hooking up with this boy that looked like Jesus. Gradually, he started talking to me more, complementing me a lot, asking to hang out. Etc. Oh and all of a sudden, liking all my selfies which hadn't happened in almost 2 years. After Christmas we get back to class and immediately he starts flirting with me. Tapping me on the shoulder and pretending not to. He did this 10 times one day. Last week he asked me to model for some portraits, which were topless. I loved it. The whole time, he would say "your hair needs to be pushed back" and then he would actually run his fingers thru my hair while looking into my eyes. It was a beautiful experience. I always hoped he would ask me that. I've just really been thinking a lot about it. And honestly, even after everything we've been thru, I still love him. Even though hes broken my heart twice. But he's never been a chauvinist assbag. And that's one thing I love the most. Everyone else I've dated were jerks. And I've told him about that. He's the only one that hasn't. Our dynamic is so different now, and its amazing. Does anyone have a clue why hes all of a sudden showing such interest in me? Do you think there's a chance of us being together? So many little things have been happening lately. Every time I see him he wraps his arms around me so tightly and runs his fingers thru the back of my hair. Hes been telling everyone about the photo shoot and he seems to be ecstatic about them. He asked me to smoke with him, which was amazing too. We got so stoned I forgot to tell him where to drop me off at. Then he rubbed my back sensually. Truth be told, I'm a little freaked out by how fast all this is happening, but in the best way possible. I'm also scared of making a move just because he's told e before he didn't feel that way. Hearing it a 3rd time would kill me.