You and Carter used to be togeher and super in love with each other. You had a feeling that you two will get married but.... you didnt. Your parents didlnt like him, they wanted you to get married to Chuck Bass which you did since you couldnt go against them so you were forced to leave Carter and marry Chuck
2 years later, you're married to Chuck without being able to be with Carter even though you missed him a lot. You didnd love Chuck, you never loved him. All you wanted was Carter. Chuck though didnt know you and Carter where together since that period he was in Italy so when you got married, he kept Carter close friend and you were forced to see him reguraly knowing that you cant be with him and him thinking you didnt love him. You never talked to Carter about it, never told him the truth about why you left him. Whenever you were in the same place alone or with people, you couldnt take your eyes of him, he was perfect
One day you were alone in your shared room (with Chuck) when someone walked in. You were celebrating Christmas and there were a lot of people in the house and you thought it was Chuck, but you froze as you heard the lock on the clicking and Carter's figure standing in front of the locked door