He didn't. And neither did he. Nemeses need each other. If you've got a nemesis, it's your responsibility to keep them alive and battle-ready. Otherwise what's the point of you?
persuaded management that I’m incompetent AND requested my performance review;
convinced a guy that I am desperate, cloying, annoying, demanding and a giant moron; and
convinced somebody who wants my job that I am utterly rubbish at it.
Oh, and because it's that kind of day... It turns out the guy (in spite of all the interest he's shown) has a girlfriend. With whom he lives. Oops, did he forget to mention that? Before chasing away all the other guys who were looking interested...