Hi JB,
I think its true, that anybody under any circumstances can be in a relationship....
Perhaps your main reason for concern should be how to express love and support, and be part of one another's world, without the chaos and destruction that can sometimes go along with alocoholism?
There is nothing that stops you from loving and supporting (emotionally) this person, from encouraging this person...even as you hold on to your wallet and ensure your boundries are such that you protect yourself from any problems that might arise...being friends sounds like a good thing...
thats my gut reaction anyway~~