Fringe tried to keep Peter and Olivia apart by introducing Fauxlivia from another world, but absolutely nothing could tear these two apart, not even an alternate version of Olivia. Vulnerable Olivia and stolen Peter met as children and formed a bond that transcended time and space. They literally turned back time to save each other and their family. Can there be a greater love?
Peter: Hello. Walter is that you? I can hear you breathing. Janitor: Is this Peter Bishop? Peter: Yes. Janitor: I'm calling from NY. I know this is going to sound crazy but I just saw a woman disappear in front of my eyes. Peter: Who is this? Janitor: Her name was Olivia. She has a message for you; she's trapped in the other universe