3x15 "The One Where Ross and Rachel Take a Break"

Chandler and Joey ponder a possible threesome with Chloe (Angela Featherstone), "the hot girl from the copy place, with the belly button ring". Phoebe, after giving free massages "to promote world peace" in front of the UN building, dates an eastern Europe diplomat who needs an interpreter to communicate with her. Ross and Rachel's relationship continues to deteriorate when she is forced to work on their one-year anniversary, and Ross' attempt to bring the celebration to her only to find she hasn't the time or the patience to deal with him, leads to a bitter argument and Rachel deciding the two need to go on a 'break'. Upset, Ross goes drinking with Joey, Chandler and Chloe where he decides to make up with Rachel and calls her. When he hears Mark's voice in the background, Ross assumes the worst and ends up in the arms of Chloe.