I regret this so bad...

About a year and a half ago I was super dumb and sent nudes to this guy i didn't know. It was one of those nudes for nudes things. Well now he tracked me down and is saying if I don't do things he will send them to my current boyfriend (been dating him for a year).

Not only do I not want THAT to happen for its reasons, but we haven't seen each other naked and I don't want that to be his first time seeing me.

I blocked the guy and made every account I have private but I'm still scared out of my mind...I regret everything I did when I was stupid...