I think he thought she was beneath him, even though My Rushed Everything is still holistically better than BBTM so
I also wish people would stop RTing that Ariana/Sean/Jhene pic like it's recent or relevant. IDK if the motive is "how nice of him to post a picture with two people he dated" or "how nice of him to post a picture with two girls he was looking to have sex with" but it just proves Ariana is in their minds again