He was right. Nathalia did know that he meant Mrs. Davidson. Her heart sank, and she said, "If you worry about her, why don't you go to see her? She's living on her own, and I think she's lonely." Mum still cares about dad very much, or she won't be so upset about the past still.
Curt looked remorseful and upset. "It was my fault. I've made her suffer a lot. If I had not married her, then she would probably have been living happily with someone who loves her."
He knew very well how the women that had been with him had ended up unhappy. Though there was a lot of misunderstanding, he knew his wife was a wonderful woman, and if it wasn't because of him, she would live a happy life.
Nathalia had to admit that she agreed with him. Curt was a successful man in his career, but he wasn't really a qualified husband. It was love and a sense of security that a woman wanted from her man, rather than success and wealth.