This week, Grey's Anatomy fans were left in shock when the potential breakup of Callie and Arizona became a terrifying reality. The couple's struggles have certainly been no secret over the years, and yet, no matter how much adversity they've faced, they've always seemed to persevere. Keep reading for all the reasons we just can't let them go, and when you're finished, soothe yourself by remembering just how much Grey's Anatomy always seemed to understand you.