I'm waiting for the punch line? Or is this not a joke? If so it's the most pathetic attempt at coping ever. Also he never said he'd save the country just for Tama, he did it for all of the citizens, which includes Yamato. And again, had she not stopped the fire or Kaidou they'd all be dead by now except maybe a few people. I know it's hard to accept but that's simply how it is, Yamato is a useful character.
Tama being Wano's nakama becomes obvious once you re-read Wano