Boyfriend has pictures of other girls in his phone. Should I be concerned?

Anonymous
My boyfriend and I have been dating for almost 2 years and today I was using his phone to take pictures because my phone camera sucks. I was going through the photos when I was done and I noticed a picture of some girl in her underwear (head cut off of course) that was dated recently. It is most definitely NOT ME. Now I'm not sure if he received it recently or just saved it to that specific folder recently but regardless, shouldn't it have been deleted anyways? I don't want to flip out over nothing but I have a feeling if I had pictures of random guys saved to my phone he'd be a little pissed too. Am I wrong? Note: I was using his phone WITH his permission.
Boyfriend has pictures of other girls in his phone. Should I be concerned?
17 Opinion