Co-dependancy. By the time she got to "I'm known to love people back to health, it's draining but"... I cut the shyt off. That's not being submissive, that's a tendancy to people please and derive yourself of self from others.
When your 'whole mentality changes' when you get in a relationship you are very likely co-dpendant adapting to whatever personality you think is going to keep your needs being met. If/when he 'cheats' on her she'll be confused how she did all of this bullshyt for him only for him to hook up with a woman that wouldn't dare.