Something That's Been on My Mind

I've come to a point when i need to let some people go. Not that i'm giving up being their friend or losing my faith that they have the ability to make the right choice, but i need to be able to let them make their own choices. I've said all i can, or at least i should have. I've told them that i'll always be there for them. But now, i'm hundreds of miles away. How do you deal with that? Should i continue to worry? Or just let them go?