According to Osho, the ache no relationship can satisfy is the soul’s primordial yearning to dissolve separation and unite with the whole—God, existence, the cosmos. Human loves are only arrows and appetizers: brief peaks that intensify thirst, not quench it. Their inevitable failure is a blessing, nudging intelligence toward the ultimate love affair where only union with reality, not persons or experiences, brings abiding fulfillment.
Deep down you miss being one with everything (God); people and experiences are just small tastes that make you realize you want the whole.