In Chapter 4, Jordan reveals the origins of Gatsby and Daisy's love affair. She explains that Gatsby met Daisy when he was stationed at Camp Taylor, and they planned to marry when he returned. However, she was prevented from seeing him off, and soon after he left, Tom Buchanan came on the scene, and won Daisy's heart-through a $350,000 pearl necklace. On her wedding day, Daisy receives a letter from Gatsby, and nearly calls the entire marriage off. Money triumphs over love though, and soon after their honeymoon Tom begins his series of affairs that will continue until the time of the novel. Daisy wastes no thoughts on Gatsby until she reads his name in a newspaper years later; Gatsby, on the other hand, searches for Daisy's name or connections to her everywhere he goes.
Jordan knows this through her friendship with Daisy, begun when they were both teenagers. she knows the wedding details because she was a bridesmaid, and was present during Daisy's minor breakdown. This scene highlights Jordan's penchant for gossip, as well as further unveiling the truth behind Tom, Daisy, and Gatsby's personalities.
In chapter four of The Great Gatsby, Jordan and Nick have gone to have tea. Gatsby had warned Nick that Jordan wanted to talk to him about something, and Nick was a little put out, thinking that his date with Jordan was going to be spent talking about Gatsby. Once Nick and Jordan are together, Jordan begins to tell Nick how she used to know Daisy when they were teenagers.
Jordan explains that Daisy was in love with an officer and was planning on marrying him when he was done with basic training. However things don't go as planned and Tom comes to town and wins Daisy over. On the night before her wedding, Daisy wants to call off the wedding after receiving a letter from the officer, yet when the wedding day approaches, Daisy ends up marrying Tom. Jordan explains to Nick that Gatsby was that officer.
Well, about six weeks ago, she heard the name Gatsby for the first time in years. It was when I asked you- do you remember?- if you knew Gatsby in West Egg. After you had gone home she came into my room and woke me up and said: "What Gatsby?" and when I described him- I was half asleep- she said in the strangest voice that it must be the man she used to know. It wasn't until then that I connected this Gatsby with the officer in the white car.
Jordan has just set up the reason for Gatsby and Daisy meeting up once again. Nick is being used as the means to get them together. Little do any of them know, that this is the beginning of the end, and the most tragic ending for most of them.