It's hard to say, without knowing more about his behavior, PRE-AFFAIR. People in active affairs often do crazy, crazy stuff (the example I often give of the otherwise intelligent, sane, female astronaut driving across the country WEARING AN ADULT DIAPER to go avenge "her man"), but they were well-balanced both before -- and after -- their affairs.
Puppy
Maybe it's just that then. He was pretty much normal until about 2 years ago it was, but I'm suspecting that he was having an EA back then though (if not a PA) with that co-worker. They were constantly texting each other and he would call her even in front of me--I was such a trusting idiot back then I didn't even suspect anything! That's when he started name-calling me and yelling every day, & my depression got really bad then too (don't think that helped)! Karen