In addition to what
@Sweetpea76 and others have mentioned about setting boundaries, there are a few things to also take into consideration for use.
You can't control how other people react, you can only control how you react to it. What your partner does to you, or says to you, that has zero power over you... unless you think it matters.
Nobody owns you, and this would still be the case even if you and your partner got married and/or had kids of your own together. You answer to nobody but yourself, because nobody else was lucky enough to be born the you that you are.
This means that you shouldn't sacrifice life, liberty, and the pursuit of your own happiness for anyone who won't at least make a serious effort to get themselves the necessary help. Sure, we all want to help "the drowning man", but we run the inevitable risk of drowning with him. Some people are too far into their own self-reinforced abyss to be brought back safely.
It's okay to love someone as a human being, that's healthy. But choosing to love someone who is destructively abusive as anything more... it may not always be unhealthy, but it would definitely fall under "good intentions". So yes, empathize by all means but don't sympathize.
Be strong enough to accept the things you cannot change about your partner, be courageous enough to change the things you can about yourself, and learn the wisdom to know the difference. Your partner is a known quantity, you've indicated she isn't going to change.
Trust me, if the positions were reversed most of us guys would've been kicked to the curb for less. I'm sorry that things aren't working out,
@ByrnesT , and codependency is a horrible emotional black hole to get sucked into -- especially when you're the independent one at the beginning.
But unlike an actual black hole, you can escape from a codependent partner. She's likely going to get mad at you when you start setting boundaries and maintaining them. So what? Let her get as furious as she wants, because you're strong enough to not enable her abuse.
You say you see the problem, and that you want it to stop. Today is a great day for pursuing your happiness... because you deserve what your partner won't even give herself.
Honesty. Accountability. Love.
Empathy.