"Since you already know I've spoken to this extent, you should seriously consider what you need to do. Don't make me say anything more unpleasant. It won't lead to a good outcome for either of us. Let's leave a little dignity for each other, avoid speaking too harshly, and prevent the situation from becoming too awkward."
"Mom, deep down, you should know more than anyone how much I long for you to come back to this family. I don't want you to leave this home over trivial matters. You should understand what your departure means. Your leaving means you've abandoned me once again, taken my father away once again, and caused every single person in this house to lose two loved ones once again. Because of you, everyone in this family bears double the pain. Have you truly considered what your actions represent? Stop being willfully selfish, thinking only about keeping all the happiness to yourself while letting others bear the pain—that kind of thinking is wrong."