Most of the people that post here are people that are going to be able to relate more to your wife then to you. Which is why this might be a great forum for you.
Perhaps reading some of the anguish and hurt experienced by some of the posters here... most of whom were victims of abuse and neglect just like your wife..might give you some sense of empathy.
I think you need to explore your sense of selfishness and entitlememt with a therapist though.
Your wife is certainly not a wayward. She is definitly a walkaway and would be netter off with a man that is loyal to her.
What can uou actually do for her and your children at this point? Seems like that would be the biggest 180. Consistently being responsible for your family. Nut not to win her back. More for the sake of meeting the needs of the others in your life, instead of meetimg your needs.