It was a really shitty period in my life and I was largely self-medicating with alcohol, so I was a complete mess. I'd promised DP I'd cut down, but the moment he left town, I called up an old friend and we went out drinking all night. The next morning I felt so, so, so terrible; not just hungover and disappointed in myself but also extremely guilty as I felt I'd let DP down. Possibly the worst I've ever felt, as it was layered on top of all the other shit going on in my life, an I had no one to blame but myself.
I called him in tears to "confess" and thought he'd get angry (my ex certainly would have), but instead he was so kind and sympathetic. We were supposed to get a puppy a few days later, but DP drove down that same day to pick him up and brought him home early to cheer me up.
I'm sure some people in the addiction community would say that this was "enabling" me, or even rewarding me for drinking. Or that what he should've done instead was set a boundary, express his disappointment firmly but kindly, show me some tough love, etc.
But I will forever be grateful that he chose to be gentle and loving instead. I think he realised that I felt bad enough as it was, and that in that moment I needed love, not a life lesson.
FWIW, I'm much better now and we're getting married soon - and the puppy is now getting into middle age!