Long distance relationship didn't work for you. Making the drive after work to Gigi's place is unsustainable. You both took a break and she met someone closer. It sucked that she moved on first, but it's for the best. Eventually, you met Brittany and things been great. She lives 10 mins away and been staying over lately.

During a date indoors, Brittany went to answer the doorbell. Since you're cooking dinner for her. However, it's your ex girlfriend, Gigi, who's at the door. The two girls met for the first time and clearly understood the situation.

Gigi: "You know he's taken, right?" Brittany: "You're remembering wrong. You must be the ex."