OLD PICS NEW RELATIONSHIP

Judy
So me and my BF have been together for 2 years and on my birthday I discovered he still has nudes from previous relationships (I didn't see them). He told me bc I was looking for an old pic of us in his phone and he kinda grabbed his phone and said there's pics in there you can't see. Long story short I got the hint and gave him his phone back. I told him that he needs to get rid of them sooner than later and he said he would. So my question is would I be wrong to check behind him and see if he got rid of them or should I just trust that he did and leave it alone??  
PLEASE I WANT OPINIONS!!