God I was married to an academic (not generalising here honest) and I used to scream at him to just be honest with himself and me.
It's all very well bamboozling you with what the definition of honesty is but the bottom line is that we all know what honesty is and there is nothing worse than having someone rationalise or detach themselves from what is really going on in a relationship.
I also (unfortunately) work in an academic environment (as a manager not an academic) and I observe some of my externally austere and respected male colleagues being extremely flattered and even really getting off froom attention from female students (from undergrad to Phd level) and commenting on them.
At first when I worked in academia this shocked me (( must have been so naive and saw a conflict between equality/lip service to respecting women and their behaviour) but am now world weary and cynical about it all. I think the thing that grates is that is not honest and out there. TBH I would rather be with a man that is more honest about things IYSWIM.
This is not meant to be a rant about academics (honestly) but a post of support to you and the situation you are in.
My ex did not say as much as yours but I know that originally he did not want to get married or have children. Though no-one forced him into it. Although he denied being unfaithful I am fairly sure he was and def continued with his ladies man persona throughout our marriage.
Ironically he has gone on to have two more children within two years of us splitting. I think his partner is a former mature student (though not entirely sure).
He was always depressed as well (perhaps it goes with the terrority) but would never do anything about it.
I am so much happier since I split with him, my main frustration is having to deal with him still over access issues etc.
And I do find the responsibility of being a single parent overwhelming. BUT I could not continue with him (was with him for 15 years altogether) as it was starting to affect my sanity.
He didn't drink much at home but did go out alot and was unpleasant after a few drinks.
His world view of rationality and detachment was also incredibly depressing. It's as if he applied academic theories to his personal life.
God that was a long cathartic post but I hope it helped. Hope it doesn't kill the thread.!!!!