I don't know if someone already addressed this on this thread, but what definition are we going by? What is the definition of "true love" and what makes it "true"? Can you qualify and quantify love? Is motherlove considered "true" because it is unconditional or does the term only apply to romantic relationships?
My practical, cynical side wants to say that true love does not exist. That it is a construct of societal values and hormones. Humans are animals and, as social creatures, we must form bonds with other humans to survive. Anyone remember Psych 101 and the study about babies and touch? Just like horses, wolves and any other social animal, we form bonds with each other and follow the rules set by the collective. Some bonds within the family or herd are stronger than others due to many mitigating factors, not the least of which is procreation.
But my fuzzy, princess-hat-wearing, romantic side wants to say YES YES YES it does exist! It's like the unicorn of relationships. Something so beautiful and magical, you just want so badly for it to be real that you just ignore that cold-hearted math that says different. But the existence of the term itself implies that it has to exist. But I don't think "true love" and "love at first sight" are the same thing.
Asheleyo, I agree with your assessment of balance, yin and yang. Opposites need each other in order to exist. If you are never sad, how can you define happiness? I think Bella said it best when she said (in NM or EC, I don't remember) love is giving someone control over you. That may be the reason for some people's aversion to the existance of true love, because it would imply true control and many people can't accept that.
"Life is pain...anyone who tells you different is selling something."