CALM DOWN. My bf has an ex-wife too. She would do anything to break us up. She's spat all sorts of venom. What if he has talked to her? Why are you giving her all this power? Maybe he deserves the benefit of the doubt. It's probably a good thing that you can't address this right now.
And, no, it is not a reason to drink. There is never again a reason to drink. You cannot control many things in life, but the drink does not help. You know that. No excuses. Breathe deeply and get on with what you need to do today.