Partiu Ninguém could be two things in brazilian portuguese. "partiu" could literally mean broken, but it's also kind of a slang (?) which means something like "going". and "ninguém" means nobody. I have no idea what he was trying to say, but I thought it had something to do with the slang version bc he seemed to be going somewhere with the car and what not.
Anyway, about the breakup, sad to think she could have gotten rid of him so many years ago, but still, good riddance for her. Better late than never.