旧爱用英语怎么说

旧爱用英语的翻译为 "old flame"，来源于英文中的一个成语 "to rekindle an old flame"，意思是重新点燃旧情绪。
例句：
She ran into her old flame at the party and they spent the whole night talking. 她在派对上碰到了她的旧爱，然后他们花了整整一晚时间在谈话。
He couldn't resist the temptation to rekindle an old flame and ended up cheating on his wife. 他忍不住想要重新点燃旧情绪，最终导致了对妻子的出轨。