I can’t stop thinking , I can’t move on

first of all I’m not an English speaker so I’m really sorry if there are so many mistakes

we broke up month ago, we were together 3 years , friends first then best friends then lovers , the last year he suddenly changed with me acts cold sometimes angry about tiny things always nervous and I don’t know why, tried to ask him million times if I did something wrong and he upset from me but he told me that there is nothing with us and he has some family problems ( he used to told me all his family problems but I said to myself maybe he don’t want to tell me this time so I didn’t stress him ) and treats everyone like that ( but I asked his friends and they told me that he is very normal ) I said to myself maybe cause I'm the closest person to him so I notice the change. I tried with all I have to stay with him despite His nervousness and ignoring me all the time cause I just love him and I can’t leave him in his darkness, I stayed a year with him like that ,And my psyche was destroyed , but I didn’t care about myself I just cared about him , and I saw him million times having fun with everyone but not me and the last time we talked about his change he told me with very cold way that he has new best friends he can replace me with them and if he were in my place , he would have left me a long time ago because of the way he treated me and he doesn't understand how I put up with him all this time. I was shocked and told him if he stopped loving me or not but said that he is still loving me , and I can’t understand anything

month ago he decided not to talk with me any more I send him messages he saw them , but no answer.

l just don’t know why ? What’s wrong with me ? I just love him ,I can’t do anything, can’t move on, I feel like I lost everything he was my only lover and my only friend and my comfort zone, he really was everything to me . I can’t stop crying, my heart hurts, tried to hurt myself thinking that I reason that he is bored with or something, I just don’t understand what I did to deserve this . I’m really trying to not give up about everything but I can’t, I’m really depressed.