I need your advice

Hello, sorry for a long post
my bf of 3,5 years suddenly broke up with me 1,5 months ago. He changed the reason many times and was really confused and in a bad mentality. He said he hopes this works out. We had amazing relationship and were best friends. We were dating since he was 15 and I was 17. Two days before breakup he said he thinks about how to propose to me. We had our little problems but no big fights mostly just quarrels. Also we resolved them right away and never gone to bed upset. When we didnt like something we just tell each other and are understanding. First 2, 5 years we were long distance meeting on weekends. Then i moved to him and living together for 1 year. I was his first relationship. He told me he doesnt know if this relatonship is right and right now doesnt see a future, but is open to the idea of getting back together. Said I was perfect and best person he knows, and he grew to be so much better person thanks to me. He doesnt know why he feels this way. (he also has some personal issues and started to like to party a lot)

We both cried when breaking up and after a short begging I started no contact for 21 days (he has memory problems so shorter than 30 days for this reason). After I reached out he was at first responsive but then he stopped replying. We shortly met month after a breakup when I came for my things from his place. He was hot and cold and looked worse mentally than me. He said he isnt ready to talk to me.

I feel if it wasnt for quarantine I think everything would be alright but we were quarantined together so spent a lot of time together. I am confused because when we were trying to work things out few days after he told me this, he changed the reason a lot and the reasons often conflicted themselfs. We will be probably trying to talk about things in a few days and I dont know how to show him that this is worth saving. I worked on myslef a lot when doing no contact and I am much better person now, overcame my fears. What should I do?