What is the narrator's principal motivation for accepting the job in Invisible Man

Feeling as if there is nothing to lose, the narrator accepts the mission and is told he will start the next day. The narrator is also willing to make a sacrifice. He takes on a new, unknown job because of Mary's kind treatment toward him and the guilt he feels from letting her down.He will also be given a new residence and a new identity. Jack gives him money to more than cover his debts to Mary and the meeting breaks up.