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By 1949, LaMotta captures the middleweight championship title, fulfilling a lifelong dream. But even triumph cannot shield him from his demons. His suspicion of Vicki intensifies, culminating in violence against his brother Joey, whom he accuses of betrayal. Such actions alienate him from his family and squander the bond that they once shared.
LaMotta’s life is a series of highs and lows, not only within the boxing ring but in his personal relationships as well. Following a significant loss to Robinson in 1951, LaMotta's world starts to crumble. His boxing career wanes, and with it, his marriage suffers irrevocably. Vicki finally leaves him, urging him to stay out of her life for good, which echoes the devastating outcomes of LaMotta's jealousy and aggression.