my body and self image

Okay so i’m pretty toned, i work out a lot and play a lot of sport. i have abs and i used to be quite confident and proud of them but now i hate them. my ex boyfriend told me how gross they looked on me and how girls shouldnt have abs. all my friends talk about how they wish they had my body and i’m flattered but my ex just crushed my confidence. i have a new boyfriend and i’m definitely over him but i’m just so self conscious about something i should be grateful for. i know i’m probably sounding ridiculous and i don’t know why his comments affected me so much. does anyone know anything that can help me get my confidence back? i’m 15 years old :)