Advice please ?

My boyfriends told some people really private things about us like my kinks and what I like and that hes touched me ect, he knows this is a really hard topic for me and it's really important to me that our sex life stays private. But now people i dont know at my school know intimate details about my sex stuff. I'm in highschool and idk how to handle this it might be a deal breaker. Please dont leave any mean comments, any advice ?