That would seem like a spaz-inspired reaction, especially considering that the lyrics also imply that he may have already known that his boo has issues with sexual discipline. Or in any event, he has chosen not to spaz outright. But the second verse has been interpreted by some as the groom deciding to call the wedding off. “closing the g*ddamn door”) and proceeding with the marriage. That more specifically comes off as if he’s ignoring this revelation for now (i.e. Where the aforementioned confusion comes into play is in trying to ascertain the groom’s conclusive reaction. Based on the chorus it does read as if he decides to deal with the situation with “poise and rationality”. So with that noted, the narrative is set at a wedding. And to make a long story short, on the verge of getting married, the groom catches wind that the woman he’s about to web “is a whore”. Or more euphemistically put, she has recently slept with another man (or men). So as further elaborated by said member, a “sin”, such as referenced in the title, is basically committing an act of evil. And the person who is the victim of this act is the one who suffers a “tragedy”. And one of his homeys who was privy to this fact proceeded to bonk her anyway. As far as the premise goes, as explained by a member of Panic! at the Disco (presumably Ryan Ross), at one point in time, apparently when he was high school or something, he fell in love with a certain girl.

Panic at the disco music videos story