People do go back, but they don't survive, because two realities are claiming them at the same time. Such things are too much. You can salt your heart, or kill your heart, or you can choose between the two realities. There is much pain here. Some people think you can have your cake and eat it. The cake goes mouldy and they choke on what's left. Going back after a long time will make you mad, because the people you left behind do not like to think of you changed, will treat you as they always did, accuse you of being indifferent, when you are only different.