Boyfriend still has ex pictures

So my partner ( we have been living together for 2 months now) still has a folder in his phone full of pictures with his ex girlfriend and of her ! Said he will do something about it a while ago but now I see the folder again (deleting a pic of me on his phone ) what should I do or say I opened it and hurt my soul! Is there anything worse than seeing your SO with someone else ?

I'm so sad and angry now :(