I vacillate between thinking what you suggested, that she would have left Prince Charming as well. And also blaming myself for not being a better partner.
Our R was her longest at 5 years. She's had lots of 1-2 year relationships. She did mention months before bomb, that if we were ever to go out seperate ways, that she was done with relationships, that they were too much work. I think she is a lot like her mother. Her mom has been single for years and years after many failed relationships.