Based on Taylor Swifts “Better Than Revenge (Taylor’s Version)” and “You Belong With Me (Taylor’s Version)” (yes it’s a loophole)

You recently started dating Peter, Melisa’s boy best friend (also neighbor). Peter accidentally said something rude over the phone, so you started going off. Melisa notices this and thinks that you’re just being plain rude to him. Melisa is a little bit of a pick me, especially to you, since she is the geeky, nerdy girl at school and you’re Cheer Captain for the juniors. After the phone call between you and Peter ended, she tries to steal Peter from you just “looking out for him”, because the relationship is apparently not healthy.