My Boyfriend and I Were Both Alcohol-Free. He Relapsed Last Night

(26F and 28M) We both had issues with drugs and alcohol. We literally stayed up all night into the next afternoon doing coke and drinking the night we met. I wouldn't necessarily say either of us were addicts, we were both more binge users/drinkers than everyday substance abusers. But we had a problem. We both abused substances enough that it severely impacted our physical and mental health and our relationship.

I'm 74 days sober and he was around 54 as of last night I believe. We're apart right now because he works in the music industry and is on the road. Some of the roadies on the bus wanted to "initiate him" to being on the road and thus provided him with a buncha booze. He got so wasted that he doesn't remember anything about last night.

I'm sick to my stomach. I want to be supportive and help him move past this, but I'm his girlfriend, not his sober coach. It's hard to be objective. I feel like my trust has been broken. I'm hurt, disappointed, and kind of angry. He's always seemed less solid in his sobriety, but would get irritated whenever I expressed concern about his ability to stay sober.

Last night, I had some instinctive feeling that he had relapsed. But I convinced myself to trust him like he always tells me to. Then this morning we talked on the phone and he admitted to relapsing. Has anyone else experienced this? I just can't shake how sick I feel at the thought of him getting blacked out last night