What a wanker he is OP, you deserve so much better. I honestly think you should block and ignore. There's nothing you can say unfortunately that doesn't make you look like he's really got to you, trying to be witty still just looks like you're bothered. Ignoring is the only option.
There's some horrible, horrible men around. I recently bumped into a guy on tinder, who was actually an old neighbour of mine, who I had a fling with two years ago just after I split with my husband. Neighbour was flaky at the time and I had no idea why as we got on really well. Should have realised then what a twat he is, but I gave him the benefit of the doubt as back then my life was such a car crash I didn't blame him for being put off.
So recently neighbour whatsapped me after we matched on tinder. He asked me to go for a walk with him that evening so I did and we had a lovely date. Talked over lots of things from before, he told me he always liked me but my situation (horrible ex) put him off. He opened up about lots of things. Asked me to his birthday party and wanted to see me again. Put it this way, there was history between us and I expected better. But two days later he hadn't replied to me and I've not heard since.
He didn't owe me anything- except to treat me decently, which of course is how anyone should treat another person. But he knew everything I'd been through and we had been there before. I was so upset he'd string me along like that. It made it easy for me to move on quickly as he's such a dickhead but I really wanted to tell him what I thought.
I'm glad now though that I kept my dignity and didn't message him again. Sorry for the derail- just made me think of how grim trying to date is. 🍷💐