we gain sensitivity...but of course we gain a lot pain...we feel what's the meaning of agony...sometimes eyes burn but no tear falls...we just feel that lover brokes our hearts bit by bit...but we gain a lot happiness, excitiment too...hands get cold cheecks burn...we cannot stop smiles...our hearts beat as if it wants to leave from chest... all that means we gain a lot feeling from love...i think so we have to feel love to understand what we gain.. so good luck for you to understand.
We gain the knowledge of our importance to another, and a glimpse of ourselves. How do I as a person, respond to love? It lets us see the very center our our souls for what we really and truly are.
We feel that we live for another person too instead of just ourselves, and we feel that another person lives for us too instead of just him/herself. That feeling makes us feel alive.
We gain companionship, solace,comfort, the ability to give our selves completely to another person and have them give themselves completely to use. We gain the knowledge of how trust and how to handle trust that was given to us.
