Why was he such a jerk to me? How to move on?

So a while back there was this guy who I’m pretty sure liked me because he used to say he “loved me” all the time, would get in my personal space, etc. Eventually I started to like him too, so I decided to be brave and I told him. He said thank you, but there was “a girl who screwed me over last year and I’m not over her yet”. I’d been turned down before, and the last guy started distancing himself from me. So I asked him if things would be awkward between us now and he said it wouldn’t be. But in the following weeks I noticed he stopped sitting with me and our other mutual friends at lunch and in class and stuff like that.
I asked him about it one day, but he insisted that I was the one making it awkward. He kept acting that way, but stopped when we and some other students had to work on this huge project together. So for months (from October to March) he acted like everything was fine. But literally the day after the project was over he went right back to ignoring/avoiding me harder than ever, walking out of a room every time I’d enter it, giving me short, one word answers when I asked him a question, stuff like that.
So finally I asked him about it again and he cut me off and didn’t even let me finish speaking; he blew up at me in front of his friends and said “Can I say something? I’m not trying to be mean, but you’re not in my world!” I was so hurt I just walked away, but as I was walking off he yelled after me about being “so tired of drama”.
I’m really hurt by this because I honestly don’t know what I did. It’s not like I was yelling at him or getting in his face, I just wanted to know what was up. I feel like a total dumb ass for believing things were fine between us when they weren’t and I feel like I was made a fool of.