The reason why Jim told her about Zac's emotional entanglement was that he wanted her to make things clear with him and discuss with him about the kids.
However, she was very hesitant and worried, not knowing what to do. What if she told him about the kids and that Zac still couldn't regain his memory and wanted to have a fight for the custody of her kids?
Their marriage now was just like a glass bottle hanging on a thin line. Zac was cold. Her mother and Mary was in the way to obstruct them to be together. And there was Leila who always waiting for a chance to win back Zac. They were all like heavy items that added to the glass bottle that hung on a thin line which could break the thin line at any time due to the heavy weight.