Quote from Phoebe in The One with the Tiny T-Shirt
Rachel: But it was so strange. I mean, I'm standing there with this charming, cute guy who's asking me to go out with him, which I'm allowed to do and I felt guilty, like I'd be cheating on Ross or something. Phoebe: Wow. So, okay, maybe that means you're not over Ross yet and you have issues with your father. Rachel: I don't have issues with my father. Phoebe: Okay. So it's probably just the Ross thing.