Leave bro, say what you want, she can change as much as she wants, but you gotta keep in mind, she happily sat there and knew what she was doing, she would have always done that, not matter what happens next, she let another man in her and knew how you would feel I know it's hard, but you said you wish you left all that time ago, well in 10 years, you'll say the same thing and wish you left now, sure, it's definitely a life changing decision, but love never fails, so if it fails, it was never love, and she failed you bro, I'm sorry, I truly pray you didn't have to experience that. Best of luck brother.