Freya,
Thanks for that, it was what I thought all along, the only thing I don't understand is that my leaving her should allow her to drink 24 / 7. The only thing that I can think of is that when we did go out for drinks it was I who paid the tab 95% of the time. I suppose she might be angry that her free beer has run out.
She should be more than happy to be rid of the "controlling, immature a-hole boyfriend"
I know what needs to be done and I know all about NC. I hope she finds someone to drink with soon and leave me alone.