Ex strung me along now I can’t get closure

the guy I dated for 3 years broke up with me out of nowhere over text 3 days after telling me he loved and never wanted to lose me and couldn’t wait to move in with me. It was a very bad break up and I was struggling a lot and it took me two months to get him to agree to meet with me in person to talk about it. When we met he told me he loved me and cared about me and wanted me to be happy and we fooled around. He then texted me that night and told me he was glad we met up and talked about things. About a week later he texted me and started to talk to me again. We talked every day and joked around a lot for about a month. Then out of nowhere he told me he started talking to some girl and was never going to talk to me again. I feel so hurt and used and betrayed and all I want is to have a conversation with him about. To tell him how much he hurt me and get all my feelings off my chest but he refuses to. He blocked my number and blocked me on all social media. It is making me lose my mind. I know if I can just talk to him and get it all off my chest that I would be okay, that I would be able to not talk to him, but he refuses and it is all I can think about. I sit at work and think all day about how I need to talk to him about it. I sit at home and think about it. I cry myself to sleep every night. I have now created multiple social media accounts so that I can beg him to just have that one conversation with me and he just blocks me again and so the cycle continues. I know I’m being crazy but I literally cannot physically stop myself from reaching out to him because I have all these feelings for inside and things that I need to say to him and I just don’t know what to do I can’t stop crying I can’t get anything done it is literally ruining my life.