Should i do this

Well I have a bf and we are happy together later today I got a call from my ex he sexually abused I changed my number I don't know how he got it it's like he's everywhere near me he scares me I'm only 18 and he's 23 he try to play mind games with me he told me "he likes when little girls get scared or upset" he refers to me. and he wants to have sex with me if I don't he will send nude pics of me to my bf when I was younger I was dumb and send nudes to him I deeply regret that please help someone I'm so scared I seriously don't want to go to my parents they will be so angry of my decision I made in the past