Non violence certainly isn't passive-aggressive. There's absolutely nothing aggressive, is there?   Some might argue it's passive.....but 'passive' has it's place. The ideal is 'assertive'......where we state our position while respecting our own needs and the other person's.

Hmmm. if it were a woman walking out of the relationship? Probably the same. It's true that when we call it 'passive-aggressive', we are making some assumptions about the person who is leaving the relationship.......and it may not be passive-aggressive. Maybe he (or, in the 'adjusted' version, she) really doesn't mind that "you could have done better". I suspect he does mind.....after all...."you just sorted wasted my precious time".