An unhappy alternative is before you, Elizabeth. From this day you must be a stranger to one of your parents. – Your mother will never see you again if you do not marry Mr. Collins, and I will never see you again if you do.” - Mr. Bennet

Mr. Collins puts Elizabeth in between a rock and a hard place. Collins has some money and social stature. Mother thinks that he is perhaps Elizabeth's last hope for a "good" (meaning money and social stature) marriage. Father Bennet doesn't like Collins really is thinking more about his daughter. He doesn't want her to settle for somebody that she doesn't love and will not treat her well.