Hmmmmm, this is a difficult one.
I would investigate further to see if there has been something else going on besides the drinking.
We all know that infidelity and alcoholism go hand in hand. Its all risk taking behaviour in one form or another.
I wouldnt make a statement about detaching. I would just do it. For me, any statements i made were not taken seriously and used against me somehow at a later date.
The old cliche is true. Actions do speak louder than words.
I am so sorry you are going through this. I hope he hasnt been up to anything bad. You are putting up with enough.
((((((((((MELLOWCUP))))))))))))))))))))