Get some space and time for yourself. You may see the whole picture a lot clearer and you wil lthen make the right decisions for you.
It almost sounds as if she has planned this, and has been intentionally pushing you out and away.
Mind you, why should you leave. If she is not happy, why doesn't she?
She needs to talk to you about what she wants, and you both need to be honest with one another.
I don't think you will end up in the nut house - just on here talking to us hopefully