Hunsford proposal from "Pride and Prejudice"

I believe the reason why it failed so miserably is the way he went about telling her. Instead of expressed truly on how he felt and why he wanted her hand in marriage, he basically just told her everything that he is giving up and that it is not like him to arrange something like this. He was being to impulsive and from the sounds of it she doesn't like him already due to him bringing pain to her sister. That already put him off to a bad start. He should have started off by apologizing about her sister and explaining his love for her. No more than that. You don't try and win someone by telling them everything you are giving up for them or everything bad that is going to happen if you do it. You let them figure that out for themselves so that they would learn to appreciate what you have done for them and so that they can understand how strong your love is for them.