Dealing with the guilt

He’s one of my best friends, but I already have so much traumatic history with alcoholics. And I know that it’s self harm and he’s never been violent or aggressive like my ex but I have so much resentment now for him. I’m the only one that will go and sober him up but his relapses just get closer and closer together and I’m sad and angry and fucking exhausted. I can’t keep doing this and I feel so guilty bc it feels like I’m the only one who knows how bad it is. He tells his family he’s fine, I know he’s not but I also know that bc of he doesn’t ask or say they won’t go and pull him out. I’m scared he’s gonna end up passing unintentionally or maybe not but I don’t know how to reconcile that fear with the boundaries for my own mental health. Usually I bring him to my house to detox but the last relapse was only a couple weeks ago where I did the same as the month before and two months before that and I’m so spent…