You know those corny magic 8 balls JB?
Here's what mine sees. I think he will stay in check until cruise. Primarily because he wants to go. He already has his daily weed and is drinking too. He will really cut lose drinking on cruise. But you'll hopfeully be OK as not much real life stressors on board. The trouble is going to be back home after the cruise.
Learn all you can on boundaries and how you two engage on the same drama triangles over and over... Hugs. You have a window of time I perceive to make some good plans for you.