In the world of modern dating, being "blindsided" is a specific kind of trauma. It’s when a partner who seemed perfectly happy—someone you were just making dinner plans with an hour ago—suddenly announces they are done.
In football, the "blindside" is the area behind the quarterback when he drops back to pass. Because he’s turned sideways, he can’t see a 300-pound linebacker sprinting toward his back. This is why the (for right-handed QBs) is often the second-highest-paid player on the team. Their entire job is to be the eyes in the back of the quarterback's head. blindside
Often, the person doing the blindsiding has an avoidant attachment style. They don't communicate their unhappiness as it happens; instead, they "deactivate" and run when the emotional stakes get too high. In the world of modern dating, being "blindsided"