How do you trust that they are "just" isolating/triggered not creating distance because there might be someone else? (People retreating and/or getting ticked off by "minor" things being signs of trouble in the relationship.)
How do you trust that their acting out is "just" a triggered situation and not a sign of dwindling respect and/or
Guilt about something they are hiding? (Deflection and anger being two telltale signs of lying.)
How do you trust they don't sometimes use their symptoms as an excuse to exert control over you and the relationship?
The symptoms of PTSD and dishonesty are sometimes so blurred...it's really bending my mind.