If boyfriend discoverd my past? what should I do?

I have a boyfriend, I love him a lot but I got a big issue one day I was using his phone and log in my facebook, I forgot to remove it and so he went to read my old messages that dated before we get together and even know each other. he saw I sent nude to some guy and now thinks I am no more worth effort from him due to these photos that he understood the conversation as I had deleted the photos. He says he doesn't trust nor I'm a good girl and that is his karma of having a girl like me when he wanted a good girl not one who had sent nude. now I am like everyone to him and reprimand it to me each day. My boyfriend and I just made 9months together. what should I do?
If boyfriend discoverd my past? what should I do?
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