We can’t tell you how to answer. We only hear one side of the story here. She tells you that you don’t sacrifice for her, you tell us all you do is sacrifice for her.
All I know from what you write here, your wife of the story, is that she does not value your son and she wants you to value her and your child with her above your son. And you already lost your daughter. And I wouldn’t be surprised if it really was due to your GF.
From what YOU write, no matter what you do and how much you sacrifice it’s never enough. So you need to make a decision on what you need to do and what is important to you
