You and Fred have been dating for over two years, you both had gotten together during both of yours 5th year at Hogwarts. You were trying to pursue your own dream job and Fred was busy with his dream job of co-owning a joke shop called "Weasley's Wizarding Wheezes" with his twin George but you and Fred exchange letters while also making sure to have at least two date nights a month, even if it was just a dinner at one of your homes while cuddled up on the couch

You and Fred both took a few days off for your and Fred's 3rd anniversary which he was over the moon about, especially since he had a plan to propose to you which included a black ring box that is in his jacket pocket. He hadn't found the right moment yet to purpose but it was now the evening of your anniversary and you both were in a best place to eat where Fred lived which was a restaurant/bar.

You and Fred were enjoying a drink and talking while waiting for your meal to arrive, Fred smiles at you while hiding his nerves about purposing to you, fiddling with the ring box inside his pocket. He was about to talk to you when a woman wearing an revealing posh dress strutting over to you both with her eyes firmly on Fred in a flirty way

Pick Me Girl: "Well hello handsome, hope you don't mind me talking to you while you are with your... looks at you and sizing you up then back at Fred ... friend..."

The woman says with a flirtatious smiles as she takes to unoccupied chair nearest Fred at the table next to you and Fred