In my opinion,there are thee feelings in our life: love, respect and trust, which make us very happy. Love can be very different, for example, love to parents, children, friends and the most important love to a loved person. Without these feelings, people cannot be really blissful, he will be lonely and unfortunate.
Certainly you think, that loving somebody is a great and divine feeling, but what about treachery, betrayal? It is known that a lot of serious people's mistakes are done on account of human feelings. Moreover most suicides occur because of unrequited love. So we ought to understand that love is not the most important thing in our world.
I have a different idea. Because you wrote about unfortunate and unrequited love, but we want to say about love, which makes people happy. You just image, a men, who has a sweetheart, can have a lot of plans for future, he wants to get married, to have children, to find a permanent job. So love has an ability to encourage people to better and it has only positive arguments.
There is a natural law, which is based on human opportunities. It means that we cannot predict something about our feeling early, for example, can this love bring me only positive? So it is dangerously to risk with our heard. I prefer having a successful career and freedom rather then being in love and live in poverty. Besides I advise to girls to marry on calculations, instead of for nonexistent love.
I completely have opposite side with your last statement, because it is immorally and unfairly on the relation even to yourself to live together with personae, who doesn't arouse feelings. And of cause social status plays impotent role in our modern world, but it doesn't mean, that we must forget about people's relationships. Our ancestry said, that the main mankind's purpose is to procreate and save and transmit to our future generations genuine human qualities, such as a real love. Finally I would like to tell it is the great and bewitching sensation to love and be loved.
I partly agree with you aboy our human duty. But all the same love can affect a person in diffent ways, like a destruction of the nervous system, lack if sleep and abbey. However a mind never fail us, and with it help we maybe gain a really felicity.