ex drama

Dy
Ok so my SO still has his ex on snap chat he doesn't send her snaps back as far as I know but he still receives them from her and opens them is it wrong for me to tell him to delete her off snap chat considering I cant see a convo or pic that was sent during snap? I know they text sometimes but he's honest about it and lets me read them or tells me about the convo not once has he hid anything but it's just something I'm uncomfortable with. And he just told me not to tell him what to do when all I said was you know you can delete her off snap chat...