To me, it sounds like contrived statements just to get a rise out of you. What he is doing/saying isn't getting the desired results, so he is turning up the heat. I'm in behavior health and one of the things we talk about is the "extinction burst." If you have a child who throws a tantrum at the grocery store because she wants a candy bar and you buy them one just to shut them up, you have reinforced the behavior. So next time, they will try it again because they know it worked before. I.e., XF has said things to elicit a particular response from you, and eventually it wears you down and you react, whether positively or negatively. So you reinforced his behavior, and he will keep doing it every time he wants a response. In order to break a particular behavior, you have to stop reinforcing it (common sense, I know). But when you stop reinforcing a previously reinforced behavior, it makes the individual upset because they aren't getting the result they expect. So, like XF, they turn up their response. The child will throw the mother of all tantrums. XF is upping the ante by talking about dating other people and moving on because he is SURE that will bother you and will break down your NC response. But if you continue to ignore/fail to reinforce the "extinction burst," eventually they get the message that you are not going to reinforce their undesired behavior anymore, and they stop trying. It works on kids as well as men.
