Basically the only person who is responsible for making me happy is me. It's not fair to place that burden on another person. It's the same with being unhappy, you may have contributed to her bring unhappy but she can't place that fully on you. People in our lives supplement who we are they dont define who we are.
In a M both parties always contribute to its breakdown in some way and if one is placing all that blame on the other they're in denial about their role in what happened.
There's no point in trying to argue that with her though. She has to figure it out herself and the only way that will happen is if you are out of the picture and she still feels that void.
Accept what is, let go of what was, and have faith in what will be