Cancer Ex turned Family Friend WONT LET IT DIE

My Cancer ex is a childhood friend among a group of friends, who became a first love, who became the first ex. In the 13 years since I left him all those years ago with both of us screaming at each other and him crying in a corner for 4 hours.......He's also the closest thing my Godfather has to a son. He still sends my mother, mother day cards. What I am upset about, is that a pattern has emerged when he reaches out. He "catfishes" me with friendship and history, and catching up with the old gang...just to segue himself in as a possible option for romance. Every time I catch the catfish, I am disappointed, upset and then I blast him, tell him no, and ghost. This has happened twice before, this third time, the straw is on the camel's back. I don't want to hurt my grandfather, or make it awkward at old gang reunions, but JFC, how do I just get him to let it go.

I don't want to be pampered, cared for, and impregnated with 1 to 4 brats BY THIS GUY. Or valued because I know how to run a home and raise children. Honestly, if I can't shake him, my only option is to call it quits and block. With him needling me about how he just wants to let me know how he feels and how I can count on him and all I can say back is: You're pressuring me, back the fuck off. He doesn't get it.

Now, I could shove the existence of my Scorpio in his face, but I'm trying to keep him out of it. A woman shouldn't need the appearance of being off the market to enforce the word No.