Tom, Daisy never loved you! She loved me for the past five years but I was away at war. You can end this charade now. Just tell him Daisy!
The American Dream enables anyone the opportunity to achieve the personal goals they have set for themselves. You have the "...freedom to be whatever you want to be and not be limited by social status, race, etc" (Kemmerer, 2018)
Gatsby wants a future in which he and Daisy are married to one another. His ideal dream allows for the pursuit of goals without any obstacles. For five years, "both of us [Daisy and Gatsby] loved each other..." (Fitzgerald, 1924, pg. 131). In an ideal world, that would be a sufficient reason for Tom to let Daisy go.
Gatsby falsely believes the past can be erased by saying a few contradictory words. He commands Daisy to "...tell him [Tom] the truth - that you never loved him - and it's all wiped out forever" (Fitzgerald, 1924, pg. 132). His opinion is clouded by his overpowering desire for Daisy, or else he may have realized nobody can escape their actions.