How to rebuild trust?

I met him a year ago while I was separated from my husband. We chatted online a lot but became more than friends before I filed for divorce. I know this was wrong and I should wait longer because we had to hide everything. He always asked me if I deleted every messages, email, texts from him. He said he does. I could not because those little things had sentimental value to me. When I felt bad, when I missed him - I could read over it. Later on, he find out I was not deleting things. He was mad at me and said he cannot trust me. I felt very bad so I started to delete everything he wrote me. No because I wanted but because he made me feel that he won't talk to me much when i don't do that. Couple months later, he made remark about me not deleting everything and not trusting me. I said I did my mistake before but I do delete them now even though I don't want to. He did not believe me at all. He called me liar. After this, he actually asked me who also knows about us. I told him about my best friend long time ago, but he was acting as if I did not. He was mad and said I am lying again. I am 100% positive I told him about her but I have nothing to prove it because I don't have our chat history anymore. IT hurts me to know how much he does not trust me and the way he tries to find problems between us. I feel like I do not have a right to keep my messages because he wants to be very careful about everything and does not want anyone to find out we were more than friends while I was in divorce process. Also, why he gets so overly mad at me for it? I apologized to him for not telling him that I kept messages from him and promised not to do it again. Yet, he does not trust me. What can I do about it? How can I rebuild his trust. I know he met his ex-wife same way he met me. I just hope this is coincidence and that's why he is so overly careful about everything. Any advice?

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