Love is always true. Because it's pure. It's deep. So, we can't say that I found true love. Because there is no false love existing elsewhere. Love is truth. Truth is love. They are 1 and the same. So love can't have an adjective of "true" after it. Because "true" is part of love. It's not separate.
Love is always true. Because love gives the highest emotional climax in the world. The sweetness, and gentleness of love cannot be matched by any other positive emotion. Because every breath of love has truth in it. Love can't be called true, because love itself is true.