What does it mean for boys to say to girls that the origin is doomed?

It means that this boy likes that girl and says that they are destined to be together. It depends on whether girls are interested in boys. If both sides feel good, it is really a love affair, so we should cherish this rare fate, get along well, care for each other and strive for a lifetime together. If a girl has no feelings for a boy, then don't accept the boy's confession and tell him that my destiny is not you.