This has nothing to do with PTSD and not that having PTSD in a realtionship makes in necessarity "dysfunctional" but in realtionship counselling circles I have read/heard that some couples tend to "feed" off the others needs and when the needs shift, they inadvenrtantly reverse to keep the balance.

So perhaps on this occasion because after all the time that you are fragile and he takes care of you, since he knew (assume) you were feeling well, he felt able to be not-so-perfect and sensiotive and express himself without treading so gently for once?

I don't mean for any of that to sound harsh BTW.