Cecilia remained silent for a moment before asking, "Why did you allow her to stay by your side for the past few years?"

This question got Mark.

Why didn't he drive Cathy away? Well, at that time, Mark thought he and Cecilia couldn't be together. Besides, he didn't want to make things difficult for Cathy given their past relationship. He didn't love Cathy. But still, he wouldn't drive her into a corner.

However, his way of dealing with Cathy ignited a conflict between him and Cecilia.

Mark opted not to defend himself and gently stroked Cecilia's hair, apologizing, “It's all my fault."