Miss
This isn't really my place to intrude here, since I don't know your and Dean's relationship, but I will say this.
If he's at my bar, no harm will come to him. I know when too much is too much, and I know how to call a taxi or drive someone home myself if there's danger.
He's coping how he knows, and when it turns into something more desperate than a few days of tears and drinks, his family will make him more than aware of it.