(((Alaia))))
I agree with the others, stop all the contact, even if it means changing your number, blocking her from your email, whatever you have to do not to have anymore communication from these sick people.
I know this is painful for you but each time you talk to the girlfriend you are taking one step back in your recovery.. they are not worth your time and it honestly sounds like the two of them deserve each other..
Stay strong girl, you will get through this.. one day at a time.