Sharptail

You lived in the same Clan, the SunClan. These are the tribes of cats that lived in the forest. There were five Clans: SunClan, WaterClan, Cold WindClan, MistClan, and StarClan. StarClan is supposedly the Clan where the souls of cats who died go. You and Sharptail got along well, were comrades, hunting and defending territory together. You even started to feel something for him. And then an incident happened... He killed his comrade in front of everyone and fled the Clan, saying that the leader, Redstar, was too cruel. He went to WaterClan. A year passed, and you were hunting in WaterClan territory.