回复：不是SELF-ESTEEM的问题，是SELF-CONTROL，没有结局的爱情就要退出

Maybe. But we can tell by the person you love to see what a person you are. She can put up with a guy like C and keeps her Love to him after she knows what a person he is, I just believe she has her own problem in Love matters. I think she should read some good books instead of playing around. She need some time for herself to review her mind and life.
One book I suggest her to read:

Love is the best choice
a book about Codependency