In the end, how is the Creature’s fate tied with that of Victor and vice versa?

One of the ways in which the text explores the creation event is by posing the question of what responsibility, if any, the creator bears to the created. Frankenstein shuns his monster almost immediately after creating him. The monster attributes blame to Frankenstein for this, and puts the onus on Frankenstein to right his wrongs by creating a mate for the monster. When Frankenstein refuses, the monster punishes him; Frankenstein ultimately comes to believe that it is his duty to kill the monster. The two feel bound to each other by the creation event, and it is this bond that, by the account of Frankenstein and the monster, establishes culpability on the part of the creator for the outcome of the created.