This Spells Love by Kate Robb

When Gemma gets dumped by her long-term boyfriend, she reacts the way any reasonable twenty-eight-year-old would: by getting drunk with her sister, her kooky aunt, and her best friend, Dax. After one too many margaritas, they decide to perform a love-cleansing spell that promises to erase Gemma’s ex from her memory. They follow all the instructions, including a platonic kiss from Dax to seal the deal.