As we meet up again in different lifetimes, we create a new pattern of energy. If you are with someone in only one life, a pattern of energy is created by the relationship. This might be a teacher in school who impressed you. The pattern moves to your soul through your memories, through your sub-conscious mind. We retain the essence of the experience.
Nothing is lost.
You meet someone that you know from before. If you can remember a lifetime that you were together a dimension opens up. You are with them in now time, year 2000, and can see this other life in the fourteen hundreds. You can see the path you walked, to get you from there to here. When you meet someone in the third lifetime, a triangulation is created.