What would you do?

I’ve been dating my boyfriend for two years this month. His ex recently messaged him asking him to pretend to be her boyfriend for two weeks so she can get rid of a guy that has been bothering her. My bf told her no and just to be honest with the guy that likes her. In previous conversations she told him that she misses him and still likes him...😬. Her and my boyfriends brother go to the same school so that’s why they still kinda talk but he has no feelings for her but she’s really reaching sometimes and it bugs the hell out of me. Should I do anything or just let my bf handle it. I trust him but I don’t trust her motives you know. She even asked him to come over and that is too much when they live really close by. Their relationship was short lived and didn’t even get to have sex (only kisses). It was over in two weeks she broke up with him now I think she wants him back 🤦🏽‍♀️