Only the great Souls can and know how to love.
Three marital bonds exist: Karmic, Dharmic and Cosmic. The first are of pain, misery, hunger, nakedness, disgrace. The second are of success, bliss, love, financial progress, etc. The third are only for the select, pure and holy souls and bring inexhaustible happiness.
The feeling that someone owes us something, the pain for the harm that others caused us, etc., stops the inner progress of the soul.