Frank remarried. I think they would have broken up even if they had won the race. Frank struck me as someone who always had to have his way and get in the last word. I suspect that Margarita realized at the end of the show and after any promotional appearances they were obligated to make together, that Frank would never accept her as an equal. She was strong enough to make it without him; he would have to have a new partner to support his ego. JMO of course.