I would recommend getting into an NA meeting and getting a sponsor if you havent already done so. The 12 step program will teach you how to focus on yourself and understand that anything beyond your own actions is out of your control. Trust is important but acceptance is the most important thing in our situation. Accept that you can only worry about yourself right now, and that whatever happens, it is that way for a reason. Good luck to both o you!
I feel really sorry for you. What a horrible situation to be in.
Console yourself with the thought that you couldn't have done anything else. If he hadn't gone into rehab, you'd never be able to quit, ant the two of you would almost certainly have split up.
This way you've both got a good chance. If you visit, try very hard not to show any sign of jealousy because that could drive a wedge between you both.
As Vicki said, this is your time now. Time to focus on your own mental and emotional health and well-being.
Thinking of you, and take care of yourself
Here's what I think: It is what it is... You have no control over his situation so focus on yourself. Don't torture yourself thinking about what he could be doing. Anyway,the rehab staff watches closely for that sort of thing because it is not allowed.
Take care of you... :)