Answer :
One reason that Elinor was upset was because there was no factual or formal engagement between Marianne and John Willoughby. She had not seen any evidence of any kind other than how affectionate they were when around each other. If there was in fact not any engagement the effect on Marriage could be devastating to her mentality, her sense of spirit, and as well as her emotions. She is so outgoing with her emotions and quite unrestrained that the prospect of her dealing with no engagement could be extremely detrimental to her well being. Elinor is also not one to gossip or spread rumors so this is quite concerning for her.
Hope that helps.Eleanor was upset with people spreading the rumor that Marianne and Willoughby had an engagement because Marianne was so depressed in her and Willoughby's division. Eleanor knew how fragile Marianne was and how her emotions guided her mind, mind and soul. No one knew yet that they had ended the bond, and at first there was no formal engagement, but Erinor didn't want Marianne to hear her rumors.
Eleanor and Marianne were surprised and traumatized that Willoughby was engaged to another woman. Willoughby showed such affection to Marianne, and she was indulged in the prospect of an engagement with him. It was completely out of his personality for her and was not expected at all. Others who saw Marianne and Willoughby together thought they were in love madly.
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