Prayers, of course.
I too think you've done the right thing, but it must have felt like cutting off an arm.
As a social services researcher, I used to be on top of all the research into "resiliency." That is, when you look at these two people, what factors helped this person have the capacity to pull themselves together, in contrast to that person.
The single largest protective factor, single largest "resiliency" factor, was that somewhere in the individual's life, a grown-up was utterly wild about them. That can be, and for many was, a lifeline. Because someone who they respected had demonstrated respect for them - someone whose judgment they valued, had demonstrated that they felt the person was intrinsically valuable. It was the starting place for re-building a positive sense of self.
Your life with him up till now resonates with that protective factor, as frankly, does your decision to ask him to leave. It is up to him now, but he's got as many resources (and more!) as any, to help him find his way back.
I'm so sorry though - must hurt like hell.
t.