Every time Valentine’s Day rolls around, there’s one dissenter in the bunch. Maybe he’s bitter over being dumped for a jock. Maybe she’s done with love after a series of cheating asshole boyfriends.

You know the feeling. When you first see your crush and your head starts spinning, your palms get sweaty, and your heart begins beating a mile a minute. Is this love? Or is it … an arrhythmia? The ...