I’m an unsupportive wife of an alcoholic

My husband is and alcoholic and addict. In August he went to rehab for a month while I took care of our 4 kids (18, 14, 6 and 1). He wasn’t back two weeks and was using cocaine again and would say “at least I’m not drinking”. Well that didn’t last long either. He’s back to full on same as before drinking every day. I’m so resentful of the “wasted” time. And feel like I have no compassion for him and his “struggles”.

Maybe looking for advice to change my mind set and not be so bitter about it all. But also tell me I’m not unreasonably a bitch. Lol.