Like asteroid belts in space, the noise of the mind makes it hard to find the signal of the authentic self.
This noise is in you, but can also be generated by others. Like a piano tuning fork resonating with particular emotional vibrations in the air, it is unavoidable.
Suffering when the cause of suffering is no longer present is a result of regenerating memories from the past. The problem that was, is no longer.
This mechanism of endlessly recycling the same emotional memories is an odd feature of the mind.
But it can also be used to your advantage.