Being very hurt right now :/ Why did he react in such a way ?

Hello ! So here it is, sorry in advance for the length of this message... but I'd really need an enlightment on this :/ I'm at university and I met a guy almost a year ago in class: he is the one that approached me at school once. We talked, he asked for my number, and started to kind of chase me, talking to me a lot, joining me for lunch every day, he was being extremely nice and sweet. He also tried to spend time alone with me by inviting me over to his place for various reasons or asking me on walks and stuff quite often but I didn't know him well, it kind of scared me out. I never accepted these invitations, always found excuses. I accepted once but acted shy and a bit distant, I stupidly escaped when I was afraid he would try to make a move on me.... he had made it obvious he wanted it to be just him and me. The strange thing is I did like him already, but I needed to go very slow I guess because of my fears, it takes me time to feel comfortable with a guy. After 5-6 weeks or so his behavior changed, he suddenly became super distant even when I was making efforts to be friendly to him and initiate contact, he seemed to avoid/ ignore me, although sometimes he was staring, and being nice again. I was falling deeper and deeper for him and somehow we still managed to talk to each other again and became kind of good friends. We spent quite a bit of time together, shared nice moments. I felt like we had a lot in common and kind of a connection. He still behaved in a way that sometimes made me feel like maybe he felt stg more for me (ambiguous behavior, sweet or flirty things ) but despite of this and of the fact that my friends were telling me it was obvious he had stg for me, I wasn't sure and was too scared to tell him how I felt.... i was afraid of being rejected and loosing his friendship. He was hot and cold. I had to move away in December, he knew it from the beginning cause it had been planned for a while. One week before leaving I was at a friends' party and he was there as well. We left the party at the same time and I managed to find the courage to talk to him about all of this. I needed to cause it was eating me from inside. I asked him how he had felt towards me and told him I had been confused about hi attitude. He seemed embarrassed, avoidant. He kind of denied at first, and eventually he kind of admitted his interest but said that me having to leave had been an issue...then as i felt he was a bit confused and embarrassed about what was going on, I told him that well, i had started to like him and he said he had the same. But even if he was acting/talking nicely I could see he didn't want to really go into the conversation. He took me home, and after this day, he almost stopped talking to me, only when there was a good/practical reason, whereas we used to talk way more. The goodbyes were awkward and short. I mean he was being nice to me of course but I could feel he was being a bit distant, closed, and trying not to spend too much time with me. He was weird. I've had warmer goodbyes with people I hadn't been that close to and spent less time with. I thought he was my friend and I got attached to him so in a way it hurt. Now I'm far away and we don't talk anymore. He asked news from me maybe once or twice the very first months but not much, and he also did a few stupid jerky things that really hurt me, so I couldn't even consider him as a friend anymore...I had to cut contact to preserve myself. Now the friendship is totally over, and even if i try to accept it and move on, i must admit i am very hurt. I miss him a lot, still love him and don't understand this. I regret to have pushed him away at the beginning and not to have made a move on him earlier when there was time left. But i don't get why we couldn't remain friends and how he can try to erase me like this while he used to seem to actually care about me and we went a long well. I just wonder why his behavior changed so radically after I confessed. Could you guys please give me your opinion on this ? Do you think he didn't actually like me ...or was annoyed by me confessing that late ? Have anything similar happenned to you, do you think i'm the one that screwed up ? Thank you in advance !

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