It depends if you’re the breaker upper or the breaker upee.
If I’m the breaker upee, after she’s told me she’s breaking up with me, well, then what’s my motivation to stick around to hear her detailed litany of each and every one of my faults? I’ve softened it up with a “Look, I accept what you’ve said but I need some time to process it.” before the details start.
If you’re the breaker upper, tell her “The problems of 2 little people don’t matter a stack of beans in this crazy world. If you stay with me, you’ll regret it; maybe not today, maybe not tomorrow, but soon and for the rest of your life.”
Or, in the most intimate of moments, just call her by her younger sister’s first name.
There’s the Sam Kinnison recommended method: quit your job, laze around the house drunk all day, do tremendous amounts of coke, until she can’t take it anymore and bolts. That way, SHE FEELS GUILTY FOR LEAVING YOU WHEN YOU NEED HER MOST! AAAAHHHHH!!!
Or pretend to get yourself thrown in jail for some horrible crime they find they most revolting. Then just have all your friends and relatives cover for you for the rest of your lives. Easy Peasy.