Have really hot consensual sex where it's very clear she's into it - while secretly recording everything. Get onto her socials once she's sleeping and archive every single conversation she's ever had with/about me, send a few incriminating messages from one of her lesser used accounts if necessary. Search 'how to make a believable false accusation' from her computer so it's in her browser history. Then find out who her new Tyrone is so that I know why she's decided to do me dirty like that.