Mr. Darcy's Struggle: A Pride & Prejudice Variation

What if, after initially refusing Mr Darcy's offer of marriage at the parsonage, Elizabeth finds herself in the position where she is forced to accept his proposal? The proud Mr Darcy has only six weeks to prove himself and make Elizabeth fall in love with him. Taking her reproofs to heart, he is determined to woo her and become a better man. Then days before the wedding she receives another offer. Will she meet him at the altar or run to the arms of another?