I agree that it is totally up to him whether he uses again or not...
But I have struggled with changing my number or just severing the relationship entirely. I haven't because I want to be there should he decide to ask for the help that I have offered in the past (to take him to a meeting or professional help). I've also wanted to be there so he will have a sober prescence in his life. Someone to talk to who is not strung out on meth or living that lifestyle.
Do you guys think it makes a difference to be around in that capacity? I feel like I am sacrificing a little bit to be in that role but is it not worth it? Does it matter?