She did not want to tell Benjamin about her and Nox breaking up so as to not create any opportunities for them both to get back together.
She said, "Don't do this again."
Benjamin nodded. "I was worrying too much."
"No, it's just that my relationship with Nox is a little special. It would be better if you didn't interfere," Shelly said bluntly.
"I'm sorry." Benjamin felt guilty.
Shelly sighed. "It's fine. I know you're just being kind. Um, I have to put Bella to sleep, so I won't say anything more."
"Okay, bye."
"Bye."
After hanging up, Shelly turned around. When she saw that Bella had fallen asleep, she tucked Bella under the blanket, walked out of Bella's room, and called Nox.