Do you let your other half see you naked?

I literally RUN and hide. Or jump on to something.. Holding myself or grab something and hide. I know there’s nothing wrong with me and I’m not deformed. I should be grateful just to be healthy and I know that. I’m just so obsessive over my body.. I have no boobs and my belly is a bit chubby. My boyfriend tells me I’m sexy all the time but I literally have a phobia of him seeing me naked and when he tries to catch me I get upset. He has cheated on me in the past which just makes me hate myself, she wasn’t very attractive but so nice and slim. Any advice please comment!