That seems simple enough.
True Love emerges, and is essentially inseparable from, Pure Being, the One Love that exists beyond the illusion of separation that characterizes the realm of relative reality. Flowing from and returning to our Essential Oneness, True Love is the fundamental kindness, compassion, joy, and clarity that always exists in our heart of hearts. Our innate ability to access True Love is the Ultimate Connectivity.
Unlike the common contemporary understanding that views love as something that someone just "falls into", in the Buddhist tradition, love is seen as a quality of heart, a mode of consciousness can be consciously cultivated. Although, we may stumble into glimpses of Oneness through an intimate connection to "Otherness" in a romantic relationship -- especially in its initial honeymoon phase -- True Love emerges from a fundamental choice to embrace Life itself, to let go of who we think we are and open our hearts and minds to the actual experience of the present moment.
Although this can happen with the very next breath, the process of actually becoming a loving person generally doesn't just happen. It is a Practice. (Erich Fromm characterized it as an art in his classic work, The Art of Loving.) True Love takes commitment, time, and effort. Like any discipline, it takes knowledge and understanding -- and patience. I hope to still be Practicing with my final breath.