Are the people who are rallying around him heavy drinkers/users...or are they family or others who are threatened by anything that might change their group delusions? My FOO was a typical dysfunctional mess...troubled, domineering father who we all tiptoed around...and a mother in utter denial to anything negative, "we're so lucky that we're such a happy family!" and God help anyone who suggested otherwise. So the good news is that we ACOA have terrific instincts in reading people and situations...the bad news is that we never trust those instincts.
Trust yourself. At a minimum, staying out all night drinking is NOT acceptable behavior in a healthy partnership.
Sending you hug.