Quote from Phoebe in The One with Ross's Denial
Phoebe: Of course not. Because you're in love with her. Ross: I am not in love with her. She was very upset about having to move out, so I didn't tell her we were still married, because she'd only get more upset. So I comforted her. As a friend. Phoebe: What do you mean "comforted her"? Ross: It was nothing. I just gave her a hug. Phoebe: Aha! A classic sign of love, the hug. Ross: It's also a sign of friendship. Phoebe: Not in your case, "Lovey Loverson."