"We Broke Up" centers on Lori (Aya Cash) and Doug (William Jackson Harper), a longtime couple who break up just days before Lori's little sister Bea's (Satah Bolger) wedding to Jayson (Tony Cavalero). In order to not disrupt the fun, the couple decides to pretend they're still together until the weekend is over. But pretending isn't as easy as they think it'll be.