I don't want to speak for Buffalo66, but what it means to me is feeling guilty for his choices, his behaviors, his actions. There is "earned" guilt, which is when we feel bad for something we have done, and then there is "unearned" guilt, which is feeling bad because of what someone else does.
The cure for unearned guilt is letting go. You cannot feel guilty for asking him to stop drinking if you do not ask him to stop drinking. Let him make his own choices. And make yours based on what is best for you.
In other words, you hand his "stuff" over to him. You stop dealing with it. You deal with your own "stuff." That's what this smiley is all about:
:codiepolice
L