How long does it take to get over a separation?

The reason that she is mad is because you did go ahead and leave. With you being gone that means that you are out of reach for being controlled and may eventually regret even being with her. If she loves and needs you so bad, then why in the world is **** treating you like Sh*t? Don't make excuses for her. Stay away until she realizes that she cannot treat you like that or you are gone for good. When you do go back, seek counseling right away. This will need some serious work.