Maybe he asks her to take him back after Valentine's Day is over, secure that he won't have to dump her again until just before Christmas. But she is onto his dirty tricks by now, and agrees to take him back only under CERTAIN CONDITIONS.
But what are they? Maybe he has to be her sex slave, prancing around the house in high heels and a garter and licking her pussy at her command. Or maybe he has to watch while she fucks all of his buddies. Or maybe he has to wear dresses and a wig and makeup in public and be her "best girl friend" all the time. Or maybe she finds some new humiliation for him each day (or each chapter of the story).