Take a Hint
There is nothing worse than a clingy ex, and at some point, you just have to learn to stop responding. Even though it is hard, you have to eventually move on from the thought that you and your ex have any chance of getting back together. Not only is it not good to live in the past, but you also deserve better and should start the process of moving on.
This whole interaction is characterized by one person not really knowing how to let go. But in his defense, at least he knows how to make light of a hard situation. Instead of taking the hint that his ex doesn’t want to talk to him, he continues to message, and even create new personal jokes between him and himself. By the end of the text exchange, it is clear that he has gone a little nuts.