You know suffering. Where does it come from? It comes from pursuing paths that lead to nowhere, that just turn around at some point and bring you back to where you started from. That is what is called in India as the cycle of birth and death.
You thought that the path you are taking is leading you somewhere; it’s kind of circular. It took you this way, this way, this way, and brought you back, and at no point was there a clear U-turn. You continued on the wrong path not seeing its futility and the suffering contained in it. Continuing on the wrong path for a stretch of time is called attachment.