I am not telling you that each if us do not have a soul to call our own. We are a part of our soul. It belongs to you, and you to it.
Memories exist as patterns. In this life, each of us come together and part, come together and part again, forming a counterpart relationship when it suits our purposes, as streams of consciousness mix and merge, and then separate.
These counterparts are psychic, relationships, formations that in the deepest terms flow into historic time and out of it. Some, in our terms, last a lifetime. Others represent psychic encounters that happens between two individuals at several points, say, but are not continuous. They may be no less intense, however.