Does True Love ever exists or is it just a Illusion?

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Hi All, I was just wondering over this concept of True Love over the past few months. Does it ever exists or is it just a made up theory? I'm highly skeptical about True Love because no matter how much you love the other person, you seldom get true love in return. I have been in a relationship and have experienced this. I think that every person in this world is selfish enough to think about himslef than to step into other's business. Some say that love begins after marriage and some say that two people marry just for the sake of family and having kids. Is that the only purpose which love is meant to serve? I want to know your thoughts regarding this. Is it even worth to love someone more than your life when all it means is killing yourself day and night just for the sake of it?