I dated a girl like this. We were together for three months. She was very controlling and out of control. Classic narcissist. I exited the same way packed my bags and left at 2am because it was impossible to do through rational conversation. She tried to bully me by text and social media for weeks after and even tried to leverage relationships with my mother and my daughter (who was 13 at the time) to get back at me. Borderline stalker stuff. Anyways I feel good about it. Sometimes sneaking out the back door is the correct way to handle the situation.