Lily whines to Rufus outside about how she's made up her mind and that's it. "I hate that I have to hurt him. I know it sounds strange, but I suddenly feel horrible about what I have to do." Rufus -- kindly -- says he would be worried if she didn't, because Rufus of all people knows that Lily's motivations are never suspect and that she never does stupid shit she's going to regret later in exchange for money and gifts. Lily thinks about the kids -- sometimes when you have a family you have to think about them for a second before you go back to droning on and on about yourself -- and almost sobs about how Eric loves Bart and Chuck so much. Which, I agree, is the worst part of this scenario.
"Eric wants you to be happy," Rufus says lamely, and then manages not to laugh right in Lily's face when she goes, "I never thought my life would turn out like this. I've always tried to do the right thing!" Which is... just dumb. Her life is exactly like this because she made sure it would be, and they had a little meeting five seconds before the wedding wherein they discussed how this is how her life was going to be. Rufus watches her for awhile, trying to be okay with her constantly and rapidly changing life: "It's all you can do. Just, uh... Smile and fake it." He looks away, trying to do both and failing both, and hurting again because he knows that when she leaves Bart his heart will open up to her, and she will just go find another Bart and break him again, and there's nothing either of them can do about it.
"Tell me something, Rufus. Something you shouldn't." Not because I'm going to run off with you, but just to add that little bit of angst lubrication you always bring to the table before I fling myself and my family into yet another bizarre abyss. "I never wanted to weigh in about your relationship with Bart," he says quietly, and she nods. "I was... Afraid of what I might say." So was she. She inches forward on her bench, every nerve and muscle screaming, come on come on come on: "Which was?" Oh, he looks like a man but damn, he breaks just like a little girl: "I let you go on your wedding day because I was afraid I couldn't give you what you needed. I wasn't sure what I needed. And I have regretted it every day since." Chuck sees them mooning at each other and pulls out a gun. I mean, his phone.
In the limo, Bart is reminding the PI that he done got fired before the Miami trip, and the greaseball is like, "Okay, but first you have to hear this amazing shit I found out." Chuck calls right then and goes, "She's here. Lily's at the Ball. With Rufus Humphrey. And from what I'm seeing, you should figure something out and get down here now." Bart hangs up and asks the PI what he's got; he hates to do this, to break another promise, but sometimes knowing all you can before you head into battle is the only way everybody can win, and that's the thing he kept trying to tell her.