Same thing happened to me. An old friend who moved out of town came back for three days and called Sunday morning and said how about we go out for drinks and listen to some jazz Sunday night.
I just said how about we do lunch Tuesday instead. We did. Friendship (and sobriety) intact.
I have many memories of the two of us partying in past years, but that ain't me anymore. My friend knows and accepts that. I have managed to re-invent myself to who I am now and like Dee says, "they haven't invented the drink good enough to risk what I have now." True friendships survive.
Thanks.