"But I'm already an adult. I'll take care of myself. No matter what I do, I'll be responsible for my own actions. You really don't have to care about me."
Back then, when they got married, her grandfather had given the Shangguan family to the Fu family on one condition. It was that this marriage could only be divorced when she wanted to. If Fu Siye had an affair, he would leave the marriage with nothing. Although she'd also have to leave the marriage with nothing, this condition was beneficial to him because they knew how much she loved him. If she was going to have an affair, that meant she definitely did not love him anymore. If she didn't love him, she could just propose a divorce. There was no need for her to have an affair.
Hence, this condition only affected Fu Siye. He could only wait for her to give up and for her to want a divorce. That was why he had been hurting her all these years and forcing her to let go.