Girl tried to get me to delete a picture of me and her in bed, sexist?

Title basically says it all, but a girl I was dating Chesney from the Simpsons'd (hit and run) me, and before she dipped, she took a selfie of her on top of me in bed naked as a proof of us being together / her getting with someone, and she sent me it (Also naked) and I saved it. So we both had it. Yesterday we decided to add each other on insta and I noticed she deleted all pictures of us together, so I asked her why she did that and she basically said she didn't want her ex to see it / didn't want a picture of her naked being out. I told her that Fair enough, I'll delete it too. But I also said to her I'm not going to delete the one with me in it, because that's a pretty wild picture, and I don't see why I would delete it, as I don't have any problem with her seeing me naked. She then said it was sexist that I won't delete it, as she doesn't want that picture of her out there, and I told her it was sexist to expect me to delete the picture of me when she gets to decide if she deletes her own one or not.