acted like it was painful for him to even have to hear words from my mouth
My WW began behaving this way after she made up her mind to seek a divorce. I suppose it's possible that she *always* found many things about me contemptuous and now has no need to repress it, but I think it's likely that wayward spouses subconsciously focus on and exaggerate any slight fault you have. That way, they feel less guilt about their own behavior -- affairs, breaking up the family, etc.
Me: 50, MLC/WW 45 Young kids Nov 2015: BD1 Apr 2016: BD2 Jan 2017: W filed Feb 2017: D final