Episode: "An American Girl in Paris: Part Une"
After Carrie moves to Paris, Big calls her saying that he "can't lose her again," and Charlotte answers the phone. The scene cuts to Big meeting up with the three girls at a café, asking if they believe he still has a chance. He tells the girls that they are the "loves of her life and a guy is just lucky to come in fourth."
Though Big admittedly hasn't been their "favorite over the years," he tells them that he loves her. He proceeds to say that if they think he has a chance, he will go after Carrie, and if he doesn't, he will leave her alone. After the trio exchange glances, Miranda says, "Go get our girl." A tear jerker every time.