Has a mistake my boyfriend make ruined my confidence and will i get it back ?

Basically me and my boyfriend have been together three years. After 6 months of our relationship he was texting a girl flirting and asked for a picture of her in her underwear. This completely broke my heart. he was 18 and onli had a few girlfriends and only ever kissed a girl he wasnt reali a ladys man. he was so apologetic and he was the one to end the chats he cried his eyes out. in a way i understand he gave in to temptation because of his lack of relationships etc. he has mae it up to me every day since and he is perfect he could never hurt me again and i completely trust that there really isnt a day go by where he doesnt try to make me feel like a princess however i have no self condience anymore i was such an outgoing person and now i cover my body up and feel disgusted with my body, i wear outfits like once and dont wear them again because i feel i need to look good for him. he hasnt seen me completely naked since either which effects our sex life. i find ti hard to relax during sex because im botherd about my body. and when i have a spot i wont let him come near me. i feel like every second he is looking at other girls but that just istn him and i no it is in my head. will i get my confidence back he tells me every day he finks im beautiful etc but i feel horrible!