Feeling harrassed and scared

I have a history with this guy, he basically took me out once a few years ago and then decided he didn’t want anything and left me heartbroken (we were friends for a long time first).

Lots of f boy stuff, so I started to ignore him right around when covid hit last year. Since spring of this year, he has asked me about 4 times to go out with him. Instead of ignoring, I finally told him a few weeks ago I really am not interested in dating anyone right now so he would stop asking…today he asks AGAIN and I felt he wasn’t as friendly and understanding as a few weeks ago when I told him no. I told him “I’m not interested please don’t keep asking”. Was that okay to say?? I’m honestly feeling sick about it and so uncomfortable especially because I could tell his tone was different this time. I almost feel harrassed in a way. I also get paranoid bc I sent him some nudes on snap a few years ago…he didn’t screenshot but I didn’t know people could screen record on their phones at the time. Even though I don’t have reason to believe he did that, I’m scared of him in a way now that I keep rejecting him. I haven’t blocked incase I need proof of anything. Why can’t men just take no for an answer?