Love not being reciprocated in situations where one person has admitted their love for another but the other person doesn't feel the same way is different from reciprocity in an existing relationship. In case your love is not reciprocated and the person you love says that they do not feel the same way, there isn't anything that you can do. You must respectfully accept their feelings and figure out a way to detach yourself and move on for the sake of your mental and emotional health.