Why does the monter feel he has the right seek revenge on Frankenstein?

The monster feels entitled to seek revenge on Frankenstein because he perceives his creator's abandonment and rejection as a profound betrayal. After being brought to life, he experiences intense loneliness and suffering due to society's hostility and Frankenstein's refusal to acknowledge him as a being deserving of compassion. This perceived injustice fuels the monster's anger and desire for vengeance against Frankenstein, whom he holds responsible for his misery. Ultimately, he seeks to make Frankenstein understand the consequences of his actions and the pain of being forsaken.