Photo of my boyfriend and his ex fling on instagram disturbs me. What should I do?

Anonymous
There is a girl... my boyfriend and her dated-flinged before we met, but there was nothing serious between them.

I remember we had been dating for a long time when the girl texted him to ask how he was, and she also wrote that she left a pair of sunglasses and she wanted them back.
(although it’s a totally crappy, few dollars stuff, I don’t think that she would stick to it that much..) anyway...

She has a photo of two of them on her instagram (on the photo: they are facing each other at a party). Previously the title of the picture was: We, but this has been erased since then.
There is even a comment below the picture, someone wrote: dating?

It's very disturbing that the girl did not delete this picture despite our relationship being quite clearly serious. (and that I know the details)

What should I do? Should I ask her to delete or tell my boyfriend that this annoys me?
What would you do?
Photo of my boyfriend and his ex fling on instagram disturbs me. What should I do?
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