Echo the others with the comment about whether he's a heavy drinker.
There could be many reasons for this behavior- and none of them helpful to you!
Glad you left - and hope you can put this in the category of "he's a jerk (or behaved as such)" and I can't worry about it....and maybe steer clear of him til the possibility of this behavior doesn't bother you.
For me, gotta stay in my own lane and not worry about anyone who's a jerk to me (fortunately, I can't think of anyone who has been but I'm sure someone will someday!).
You're on the right path- keep going!