I had a bit of a chat with a friend last week about this same situation.
She wants to stop, and when she is almost there, her male friend brings the booze, and cycle begins again.
I asked if he respects her desire to deal with her drinking?
Turns out, he felt "threatened" when she was sober and getting stronger.
He hid that, but she saw the truth, at first suspicious him and why he was not taking her drinking problem seriously.
Well, he drinks and if she stops, he may have to "adjust" things to, and that is a "fear" in them, though they may not expose it. It disguised into a guilt trip a, "not part of" type of thing.
What they both do it's up to them, but I have heard this similar circumstance a few times in my sobriety.
In the end, something has to give....,
A lady friend in my early sobriety kept drinking....her friends were around who drank and I knew I just cannot drink and be "normal" like they were.
Then I got the " ha ha look at us, we drink", look.
That was it for me, so I left and never looked back.
Today, I do not know where all my ex drinking fraternity is, everyone has move on.