I believe that the anger is still there, so I agree with you on that one. He has implied that he felt mistreated and neglected, and I'm sure his biased listeners have further encouraged this.
Passive-aggressive has already happened a few times, I believe. He's made some comments that seemed like "slaps" or backhanded remarks about how now I won't have to worry about him/I can do what I want (e.g., with possessions, with money, with my time).
Also, comments like "It took me leaving to get your attention" demonstrate his resentment. It will certainly be a challenge when we reconcile. [Positive thinking--not "if" but "when."]
