For me, the fact he tried to compel the WPE CEO to work for him or else he would expose that she was in negotiations with him is the most unhinged thing I’ve ever heard in a hiring process. Quite literally an affront to freedom.
My most charitable guess at what is going on is severe mental illness.
It did all seem to blow up around when he came back from a sabbatical, presumably taken because he really needed a break. Though I guess that he also had a bit of a PR disaster with Tumblr during that sabbatical, so...