Boyfriend has nude pics of his Ex's on computer

Hi I need some advice as to what I should do. My boyfriend and I have been together for four years and lately our sex life has basically become worse and worse to where now we only have sex maybe about once a month. We both work shift work and various hours and are both usually exhausted when we go to bed so I blamed our dwindling sex life on that.

Today I was looking through my boyfriends computer which he has had only for a month and found tons of explicit photos of four of his exes. Which means he has transferred them from I'm assuming his old computer to his new...

I'm pretty upset by this what do you think I should do ...
Boyfriend has nude pics of his Ex's on computer
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