"Girl" is a childish term of address and could suggest that women are seen in the same category as children (infantalised). Generally, women are made to seem powerless, young and naive. The use of "keep" implies a misogynistic view and deep rooted derogatory nature. Suggests women were merely property to a man, and had no other value within society. Shows he's more concerned about his reputation as an upper class man, rather than maintaining a relationship with Sheila