Ex boyfriend

I broke up with my ex of 4 years. I had to leave him because he wasn’t bettering himself. He would still at home and play fortnite all day. He hasn’t had a job since we were together (12th grade). I since have graduated high school, work full time , then went to college and continued to work full time. Got my college degree. Got a great full time job in my field while he still just plays fortnite. I told myself this is enough and left him. He threatened if I left him he would post my nudes and naughty (threatened me on the telephone so no proof) and after I told him that’s illegal he said he can’t control what he does when I put him in this histaric mood (from breaking up with him). He hasn’t posted any online yet but he keeps sending me photos of myself or with his dick in my mouth (unfortunately, I’m sorry I do regret this, but we were together for 4 years). He sent this photo from a random number and I don’t even have proof it’s him. (I hope it is and he didn’t send it to someone else) . But what do I do? Please I need advice.. if he posts it online everyone will see it, my life will be ruined.