Comes in waves, doesn't it? And you never know when the next one's going to hit.
You are absolutely correct. Your W has to tell you if anything you say or do upsets her. I'm sure you've been married long enough to KNOW when something you say or do upsets her but if she is anything like my wife, you probably have to deal with the passive aggressive nature for a while before she finally explodes.
If she can reign her reactions in and simply be open with you about whatever it might be she is feeling, I'm sure she'd find it to be rewarding and a hell of a lot less stressful.
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Me: 39/W: 37 D13-D11-S8 M/T 14/20
EA confirmed: 9/13/07 D-Bomb: 9/19/07 OM Gone since 12/18/07 W wants to fix marriage: 3/16/07