how do i cope?

i was raped as a child by a family member multiple times, i've had a boyfriend for two years now(lost my virginity to him and never had a problem) the last few months my sex life was pretty bad. not all the time but a lot of times it would end in me having flashbacks to younger years and having to stop. he was so understanding. two months ago i was sexually assaulted by a stranger. i told my boyfriend and two weeks later he left me for someone else. i feel sick knowing he's sleeping with her and it's probably so normal, she doesn't cry or freak out about being raped like me. but me on the other hand i can't think about having sex with anyone else because he was so comforting, can't touch myself, i even have such a hard time being naked alone because he's not here to comfort me when i have those bad feelings. he's with someone normal.