We frequently meet the same people from one lifetime to the next. We often take turns - lovers will be enemies next time. Soul mates will always come back together. Other souls can also become addicted to certain patterns like revenge or obsession, and when this happens, one soul must be the strong one and break the cycle by not behaving as the other one expects them to. This is why some people seem to suddenly change and go from being deadly enemies to friends or vice versa.