Why did Paul was justified in resenting his brother?

Paul was justified in resenting his brother because he felt consistently undermined and overlooked in their relationship. His brother's actions often prioritized his own interests at the expense of Paul’s feelings and needs, leading to a sense of betrayal. Additionally, the lack of support and understanding from his brother contributed to Paul's feelings of isolation and frustration. This accumulation of negative experiences fostered a legitimate sense of resentment.