Sarah realized that Charles didn't trust her. She didn't know why it hurt so much, she felt like her world was collapsing in front of her. Charles continued to believe and defend others over her. Sarah realized that Charles would never completely trust her like he trusted Emma, he would always be suspicious of her.

But why was he blindly trusting the others over her? That was the difference between Emma and her. Emma had his trust, whereas Sarah didn't.

Christina interfered. ...