Quote from Chandler in The One with the Giant Poking Device
Chandler: I think you should go back with Gary. I don't want to be the guy that breaks up a family. You know, when my parents split up, it was because of that guy. Whenever I'd see him, I'd always think, "You're the reason. You are why they're not together." And I hated that guy. And it didn't matter how nice he was or how happy he made my dad.