I'm VERY close friends with my first husband, who's been sober 36 years. Of course, he had been sober since the year before we got married, and our divorce had nothing to do with alcoholism. I stay with him and his wife when I go out West to see my kids, and he just sent me all his personal financial info because I'm the executor of his will. There's a deep level of trust on both sides.
Only time will tell how things work out between the two of you. I think it's rare to remain good friends but it can happen.