You did so well to recognise this threat as an opportunity to leave this abusive relationship.
Especially as, irrational though it may be, being able to say it was HER decision must help to put your mind at peace to some extent!
Her wording is incredibly aggressive - it reminds me of a gangster movie, where some Bronx mobster is being particularly menacing.
You will reach a point one day where you'll just laugh at stuff like this and walk away without a second thought. But in the meantime, it's going to be hard. For myself, in the past, a message like that would typically trigger an overwhelming sense of shame and a kind of urgency to MAKE EVERYTHING OK AGAIN by whatever means. Which meant throwing myself under the bus again just to restore some kind of fragile peace.
The trouble is that every time you jump to do that, at your own expense, you lose a little bit more faith in yourself. It completely erodes any self-confidence you ever had. For someone who has never learned to look after No. 1, it becomes increasingly difficult over time.
You can recognise the financial damage from this relationship, but there are many other less visible forms of damage. Some of them, you probably just take for granted as part of your nature, but they needn't be. We can get caught in a loop where a relationship feels right because it mirrors all our expectations of ourselves and other people. There's only one way to break that cycle, and you've taken the first step.
Protect yourself from further harm. Be consistent with this, so that you learn you can rely on yourself. Make it as easy as possible for yourself, which in these case means avoiding contact because you can't always see the manipulation for what it is.
I bet just reading that makes you sweat about her welfare! What about her? What about her? What about her? Her life is not yours to sort out. There's a good chance she never will, but that is her journey, not yours, and her learning curve, not yours.
Changing mental/emotional habits follows the same principles as changing any other habit: keep doing the new/desired thing until it starts to come more naturally. Whenever you hear that urgent internal voice, What about her? - remind yourself that the "her" is YOU - that voiceless, faceless child within you who has not been nourished and protected... yet. She deserves, and desperately needs, all of your loving care. Stop siphoning it off elsewhere.
You can do this.