Just when it was all starting to make sense...

Why is it just when everything seems to fall into place, he re-enters? It's like he has a radar that sets off an alarm when I am content and he must swoop in and stir things up again. Just when I finally get the "what if..." out of my brain he oh-so-casually throws out a "how are you? what are you up to?" Is he miserable and wants to know if I'm miserable too? Is he still interested? Does he want to be friends? Why can't I just write him off like I can so easily with others? I'd like to know the name of this game so I can figure out the rules,please. This is a reminder of why this wall is up-it's because of him, but that's still not enough for me to say goodbye for good.