I agree it is polite at times to agree with someone rather than cause a ruckus but it is still deceitful and I do not know that it was necessary with Marianne. I do not think she would have caused a ruckus. Marianne does not agree with Elinor or Edward on many subjects yet she has much affection for both. Since Willoughby is not stupid or insensible to Marianne’s manner towards him my take is Willoughby was more interested in acquiring her good opinion fast rather than honestly. I do not believe politic agreement is a good foundation on which to build a relationship with anyone but consider how important it is to Marianne for her partner to share the same tastes, opinions and enthusiasms as she does. It would be a devastating blow for her to learn otherwise whether it be only a few or many disagreements. Willoughby’s statements and behavior suggests he and Marianne do think alike but they also convinced everyone he was going to propose to Marianne. Instead he left the country and has not communicated with her since. Marianne would never have left Willoughby in such a state as he left her—in this at least it is sure they do not think alike. Additionally, in Ch. 4 “to say what she did not believe was impossible” for Marianne even for her dear sister’s benefit so Willoughby’s saying what he did not believe about his tastes, opinions and enthusiasms is actually the opposite of how Marianne thinks and behaves. (;D)