how do i do this?

how do i tell my first love & the love of my life that i don’t want to talk to him anymore? he’s always cheating and hurting me and lying and not making any effort and he doesnt care about my feelings. i’ve tried multiple times telling him how i feel and he always gets angry and never says how he feels. i also tried multiple times to stop talking to him by saying to treat me different or i’ll leave and he says fine but he comes back. i just need help, please