Each party in a marriage wants to get the handle on the other, take the initiative, and control the situation. In psychology there is a word called "non-love behavior", which means in the name of love, the person who is loved is deprived of love. For example, someone might say to her husband, I have sacrificed my youth and career for you, so you must do this or that for me; this is non-love behavior. Non-love behavior towards close people can easily cause psychological harm to family members.
Many people involved don't understand that between lovers and between family members, that vital point is love.