There are plenty of reasons to not go to someone's wedding. It's too expensive, it's too far away, you've already used up all your vacation days on everyone else's dumb weddings. But if you don't go to your sister's wedding, something serious must have gone down.
One woman took to Reddit's "Am I The Asshole" to figure out if she's the asshole for refusing to attend her sister's wedding because her sister is marrying her ex-boyfriend of three years. At first glance, it would seem as if the original poster is NOT the asshole for not wanting to see her ex-boyfriend marry her sister, but it's a bit more complicated than that, and hoo boy, let's get into it.
OP describes how she was in a three-year relationship with a man we'll call Tonio. She detailed how he paid for most of her meals and almost the entirety of their shared rent, but "the one thing we could never agree on is how frequently we would be intimate."