I'm going to choose my girlfriend over my parents
Why don't your parents matter more?
I think my girlfriend is in a bad situation. I should be with her.
That is a hard decision to make, and I'm glad you stand firm in your beliefs. You are an adult now and can live on your own, you can't always be at your parents' whims. Your girlfriend could potentially be your wife, and always putting your parents above her can prevent that.
I'd do anything for her, so this is an easy choice for me.
It's really good that you feel so strongly for your girlfriend. She's lucky to have you and I hope everything works out for you.