Have we ever heard people say "I love unconditionally" to such person, that is to say, if it is in the couple environment, this person could be doing things for the person he/she loves without being reciprocated and this does not matter, since he/she is not placing any condition, which I do not see that this will bring any benefit to his/her emotional well-being in the future, since he/she could become frustrated all his/her life.
We know people who may do things for another person in the hope of being able to win his or her love but without putting any conditions without showing any trait of feeling of love, and this way of loving usually ends in suffering for that person who loves unconditionally and the worst thing is that he or she can spend a lifetime wanting to win the love of that person who may never come.
Many may think that loving each other as a couple has to be unconditional, otherwise living together would not be possible, I think the opposite, love cannot be conditional and if we notice that living next to a person hurts us and even though we love him/her we do not have the obligation to stay by his/her side as if we were enslaved to that person, love as a couple should be reciprocal but without conditions, helping each other in the construction of the family such as the education of the children, among other responsibilities that are part of forming a family.
We parents may believe that we must love our children unconditionally, something that I think is true, they are our children and we must love them, but this does not mean that this unconditional love makes us do things that go against our principles and values, this is not loving our children because if we have to correct them we must do it and that they are not the ones who lead us.
Unconditional love must be restrained when it comes to couples and we must know how to manage it when it comes to love for our children. This is the way I have tried to do it throughout my life with my relationship with my partner and with my children.