How does Victor Frankenstein feel toward the monster he has created?
Immediately following the moment when the creature first comes to life, Victor's dream of nearly two years, he says that "the beauty of the dream vanished, and breathless horror and disgust filled my heart." He is unable even to look at the creature, and so he runs from the room. Victor did not expect to have this response because he actually chose the creature's features to be beautiful, and though it seemed "ugly" when it was unfinished, Victor now feels that the horror of seeing its features animated is truly awful. For this reason, Victor calls him a "wretch" and a "miserable monster," saying that "no mortal could support the horror of that countenance."
Two years later, when Victor has returned to Geneva, he sees the creature and realizes that it was he who killed Victor's brother. After the murder conviction and execution of Justine, who the creature framed, Victor travels to Chamounix to take in the scenes of nature and, he hopes, to be healed by them. However, the creature takes this opportunity to confront Victor, and Victor calls him a "devil." However, the creature's words force Victor to feel "the duties of a creator towards his creature [...]." Thus, after hearing the creature's story, Victor feels some obligation to grant his request for a mate. It isn't until he has second thoughts and destroys the mate he worked on that the creature vows to exact revenge. At this point, the creature becomes the monster Victor felt him to be, and he picked off Victor's loved ones one by one. It is this behavior, most especially the murder of Elizabeth, that compels Victor to take his revenge on the creature or die trying.