Living the rest of your life in a natural paradise with your supremely intelligent, cute, and funny alien bestie who knits, loves you, and would die for you
vs.
Going back to a place where you don't have any family or friends not to mention last time the government forcibly put you into a coma and shipped you off to a distant star cluster on a one-way mission to maybe save earth from freezing over the next thirty years but really who cares?