Reducing expectations in relationship is an indirect process. You cannot reduce them straight away. Reduction in expectations is a byproduct of change in your attitude. You need to understand that giving 100% in relations is your attitude but it is not necessary that other person have the same attitude. Unfortunately, emotions do not follow Newton’s third law so it cannot be equal from both ends. Giving 100% does not give you guarantee of getting 100% back. This understanding will reduce your expectations automatically.