(((Katie))))
I imagine that mail was like a kick in the gut.
You do what YOU need to do to find peace.
You are not a soft drug dealer (sorry sojourner, but thats a little rough)
Last year you just weren't ready to take the step of pressing charges, this year you've come to the realization you have to to save yourself, and perhaps him from himself.
Our actions don't make them use any more than they make them quit...although staying in denial can make things a lot more comfortable for the addict.
I can't yet cut off communication with my son, even though my most peaceful days are when I am not in conversation with him. Maybe take this one step at a time and decide if and when he calls whether you need to talk to him. You can always change your mind.
Wishing you peace and clarity
(((Hugs)))