S3E17 · The One Without the Ski Trip

Complete story — includes the ending

The aftermath of Ross and Rachel's breakup leaves the group in a state of stress, as the other friends are trying to keep them all intact without alienating the former couple. Rachel understandably does not invite Ross on a weekend ski trip with the rest of the group, but less rationally refuses to contact him even after Phoebe’s cab breaks down and they have no other way to get out of the snowy back-country road they are stuck on. Phoebe contacts Ross covertly to come help them, which he reluctantly agrees to, and Rachel is angry that he was called and insults him when he shows up, leading to Ross in turn getting angry at her and declaring that Monica and Joey agreed with his "we were on a break!" defense. Things get so bad that Chandler nearly has a breakdown, but Phoebe bluntly tells Ross and Rachel that enough is enough and they have only two options: be polite to each other and function in the group, or be this way and see the friends break apart for good. They agree to be civil, and Rachel invites Ross to join them on the trip, leading Ross in turn to politely decline and wish them a good time.