Lord Windermere is a charismatic, popular, wealthy aristocrat. He conforms to Victorian ideals of masculinity in his social interactions with both men and women. Lord Windermere demonstrates a great deal of affection and care for his wife. He showers her with lavish gifts and attention. At the same time, he cheats on his wife and belittles her concerns of his fidelity. He treats Lady Windermere’s concerns as childish. Lord Windermere shows great concern over his social standing. He covers his affair nearly perfectly. His good standing in his community and circle of friends is important to him. Due to this concern with good standing, Lord Windermere tries hard to keep his marriage from falling apart, despite his longstanding affair with another woman. Lord Windermere is a perfectionist in his business and social life and is unforgiving of mistakes. He states in Act 1: “… to suffer for one's own faults--ah!--there is the sting of life.”
He isnt having an affair he is only paying Mrs Erlynne because she is the mother of his wife. So he pays Mrs Erlynne to keep quiet about her identity to Lady Windermere because it would bring great shame on her.