Not your ownership.

Not making someone your psychological property is perhaps the main skill that is necessary for a happy relationship. It is a heavy burden mostly for the one who is attempting to usurp someone, because the other one anyway remains different and cannot be owned by anybody. It is especially hard for the former to accept the fact that their partner may leave at any time without asking for permission. That's the point, IT'S NOT YOURS. And it was never. The other person can't be owned. This simple truth, however, cannot be accepted unless you work on it consciously.