wouldn't go. You'll be expected to be with him all the time when you definitely don't want that. Because he can manage short phone conversations doesn't mean he'll be bearable. A beautiful place can be hell if you're there with the wrong person.
My ex husband was stationed in Vicenza Italy (about 40 min by train to Venice). I was drinking heavily and miserably at the time. There was a group trip for his Combat Support company. It was in Asiago Italy. The Alps!
Wow, what a beautiful, glorious picture perfect place. The views really did take my breath away.
But, we were miserable, both of us, either drunk or hungover.
I would never waste another minute of my life, no matter where it was, unless I could dump the drunk (and I am one).
Please save yourself some misery, and take a zipline in Costa Rica when you can do it your way, not the company's way, with a drunk on the side.
Beth