Hi
I'm sorry... I have definitely said this to the ex that I later regretted, like I felt he loved getting drunk more than he loved me. Actually, it was true but probably didn't help too much at the time. I have to agree with the other posters that said your comment is not the reason for his drinking. Rather, he has developed a very maladaptive way of coping with his feelings by drinking them away.
Definitely apologize and try to carry on as normal.