one of the worst parts of working in addiction medicine, is when a patient disappears, stops answering their phone and stops coming in.
we don't know why, or if they're even still alive, most of the time. they're just gone.
Yes, it's that way in the fellowship, once tho, I ran into a fellow that I sponsored, that had gone out 24 years previously, he made amends for not being truthful, and had 14 years clean.