He wants the “old me” back

My husband and I have been at each other’s throats for at least 2 weeks and in the midst of our fighting her told me that he just wishes I would go back to the “old me”. He wants me to go back to how I was at the beginning of our relationship before he lost my trust (emotionally cheating and lying to me) and when I had more confidence in myself that I wasn’t so worried of him cheating. When he said this at first I was pretty offended, does he not realize he is the one who made me not trust him? He made me doubt him and his loyalty. He made me feel like I wasn’t what he wanted because he was looking for it somewhere else and lying about it. After thinking about it and us both agreeing to work on this relationship I agreed to work on myself and my mindset. My question to you guys is how do I do that? I’ll never forget the pain that he made me feel but I want to be with him. I want to trust him again but I’m scared to.