Love is a philosophical phenomena. So definition of love depends on the person's approach towards love. Some one may feel that love is only about giving. He does not care for gains. But if you want something back, than you always find sorrow, lose and sufferings in the end. Beacause no one completely understands another person, not even his own mother or father. Another fact is that in this world no one is born to fulfill your wish. Everyone has his own freedom. But in love you loose that freedom. Expecting is an act of making someone precarious and dependent. So you have to be ready to face everything in love. Anything may happen there.