All sides agree on two things in this fatal international love triangle: Kyriakos Amiridis, the Greek ambassador to Brazil, is dead, and his wife’s young police-officer lover killed him. But from there, the tales diverge, creating a salacious mystery that has riveted Brazil and Greece since Amiridis’ charred corpse was found Thursday inside his torched rental car just outside Rio de Janeiro. The wife — Francoise De Souza Oliveira — has reportedly told Rio cops that she was cheating on the ambassador but she had nothing to do with the murder. Her lover — military police officer Sergio Gomes Moreira Filho, 29 — told Rio cops that he’d rushed to Oliveira’s home last Monday night after another of the couple’s epic fights. He and the diplomat argued, and he killed the ambassador in self-defense, and then he got his cousin to help him dispose of the body, he reportedly claimed…