The One Where Ross And Rachel Take A Break - S3-E15
Corrected entry: In the one where Rachel and Ross take a break, Rachel suggests that she and Ross take a break from dating each other. However, in later episodes she denies that they were ever on a break in the first place.
Correction: No, she doesn't deny that they were technically "on a break", she just doesn't feel that makes it any more acceptable for Ross to have gone off and slept with someone else whilst they were still trying to work things out.
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