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double rebound: help

last year I liked a guy that I didn't know that well, but was too scared to tell him. the year ended and I still didn't say anything. during summer thinking about him was completely controlling my brain. I just felt that there wasn't ever going to be anyone like him.
university started again and I met a new guy in a society and I wanted to get to know him to get my mind off the first guy. I didn't have feelings for him at first. we were talking a lot and I thought he was a good person and after a few times of seeing him(as friends) I started to get very attached to him. I eventually made it clear that I liked him, but then I realised that the feelings werent mutual. he stopped being friendly to me too after that and doesn't want to text or see me anymore and now I'm really upset because he was kind at first.
whats wrong with me? Im feeling really sad about it. what should I do now? I dont go out much anymore and stay in my room most of the time incase I see him :frown: