*sips tea*
I am bewildered no one talked about how this does happen in real life.
Of course, not as "romantically" as these manhuas show, that is just what the society wants; but in real life, it is very common for the abused to be hesitant to leave the abuser. Most of the time, its the good memories holding them back, the sound in heart which tells them, "He is a good person at heart, he just gets angry sometimes. Once his stress is gone, he will love you lots", though there is also the factor that one gets used to abuse to the extent that regular world looks scary and uncertain.