Why did godfrey marry molly?

Godfrey Cass married Molly Farren primarily out of a sense of obligation and guilt after their brief relationship led to her becoming pregnant. He was not truly in love with her, viewing the marriage as a way to escape the consequences of his actions and to maintain his social standing. Additionally, Molly's status as an outcast and her struggles with addiction added to the complexity of their relationship. Ultimately, Godfrey's decision reflects his internal conflict between personal desires and societal expectations.