Didn't I? If I just let her go on about how she can't leave me despite the fact that she kept showing me how I'm not good enough how is that letting her make up her own mind?In your case, you didn't have enough respect for her to let her make up her own mind whether to leave or keep working on it, to weigh her own priorities.
Exactly.As you said, you shut down. That's you. You didn't want to deal with it anymore. And that's fine, but don't spin it that it was an unselfish act for her. Although I do generally agree that if a person tells you anything that conveys he's not good enough for you, you should believe them. Because otherwise, they wouldn't be saying it.