Carmen's Caster

Carmen has a one-night stand at a bar after an intense breakup with his now ex-girlfriend. He wakes up in bed with a girl he has never met. Not knowing what to do, he treats her as his current girlfriend, believing everyone should be respected. Trying to recover his guilt from last night, he offers his phone number to her. What'll happen once his ex-girlfriend discovers his newfound bond? Perhaps everything will be fine, right?