How are human relationships, including the notion of marriage, impacted by the frantic pursuit of social status and wealth?What explains their vastly different treatment of women, especially Marianne Dashwood?

Sense and Sensibility book by Jane Austen

In Sense and Sensibility, Austen depicts several ambitious and greedy
individuals. How are human relationships, including the notion of
marriage, impacted by the frantic pursuit of social status and wealth?

Both Willoughby and Colonel Brandon are privileged men but also
constrained by their social position as landed gentry.

What explains their vastly different treatment of women, especially Marianne Dashwood?