He lied about drinking.
That is enough to tell you that he is not going to do it alone.
He put son in the middle, made him feel bad for being honest. This is what ACOAs deal with, not having a proper barometer of what is OK, not OK, what is real, what is "normal".
These are behaviors that I would call unacceptable.
Are they acceptable to you. That is all that matters.
Just for right now, you dont want to be with this. That is what you need to know.
Giving him the chance to string you along for another week, month, year, 2 years, 10 years, by saying, IF you do this, I will do this is opening a door for his manipulation, and you will resent yourself for not doing what you know you should right now.
I know that self resentment so well. 10 years later.