Nobody but he can decide if he is an alcoholic.
However, if he is, the booze will take precedence over everything in his life. It will outshadow you, outshadow his work eventually. In the end, outshadow his life. An alcoholic will take and take and take.. until there is nothing left. I know...... I'm an alcoholic in recovery.
Please don't think you did anything wrong at all.
I wonder if before he moved in, he thought he had to 'hold it together" to impress you so he could move in. Now, however, he can let it all hang out.
Now you have to learn to take care of you. And these marvelous ladies in this forum will help you do that. And....... get thee to a face to face Al Anon meeting!
Take care, littlestar.