Apparently he either isn’t getting the message, or he’s gotten the message and, in his obsessive state, is refusing to recognize the reality of it. Harsh or whatever, block him every possible way he can get to you.
What you’re describing is pretty scary. Anyone that obsessed is potentially dangerous. I agree block him. If you want you can send a final message where you make it crystal clear, but you’re not obligated to. Many people have suffered because they didn’t want to seem too harsh to an ex. If he continues to find ways to make contact or attempt communication or make claims to own your submission… I would consider a R/O.
Also… if he says he is “waiting on you..” he KNOWS you ended it. He is choosing to ignore your wishes.. lack of consent. Huge red flag. Add to that your previous reasons, and I think this is more serious than you may want to admit.