Hi...read your post and my first question to you is this. What have you tried that makes her take you seriously? So far, no offense meant here, what I've read that you've done....is pretty much the same type stuff others have done that have come here. What you aren't doing is setting boundaries/consequences for her to take you seriously.
What it appears to me she's done when you've tried to talk about this in the past is discount your needs. I'm suspecting that you two are lacking the EC (emotional connection) that you've probably read many of us talk about on here. When that EC is missing, the other person will go through he!! & back to avoid intimate contact.
Have you told her you were thinking about leaving at one point? If not, why?