Love is the most powerful force in the universe. Neither time, birth, death, nor rebirth can ever separate those who have formed a deep mental, spiritual or physical bond.
Physical separation and parting for more than a short period of time, as we know it, is impossible. Mental separation is unknown on a subconscious level. Communication will always continue, although it may not be consciously perceived.
People with whom you have a deep bond in this life have been close to you in a previous lifetime. You may have been lovers, friends or relatives in another time and another place.
Lovers from the past will reincarnate within the same time frame again and again. Although they will not remember their past lives when they meet in their next life, they will be strongly attracted to each other and their love will be renewed. In each new incarnation the love will deepen; hopefully, it will grow more unselfish, until, after many lives, love is perfected.
In all relationships, each individual fulfills their karma, either through atonement or reward. When you have the opportunity for a reward relationship, there is an indescribable bond that forms the two of you as one. I was lucky to find this late in life. Love truly is the most powerful force in the universe.