bf has pics of past gfs on his phone - I need advice

Okay so I need to know if I’m crazy. I’ve been dating my bf for 2+ years and we are super compatible and loyal to only one another. However he has some old photos of his gf from 5 years ago saved in his Snapchat memories (just a few selfies of the two of them), and then a single (one) nude in his camera roll of a girl he fw before we started dating (I know because I creeped once lol). He also has 14,000+ photos on his phone, so I don’t even know if he knows they’re there.

It doesn’t bother me 98% of the time, but sometimes I think about it and it makes me upset because I deleted every photo of every guy I dated when I met my present bf. We are planning on getting engaged in a year or so, and I just don’t know how I feel about those photos. Now before you say “okay then say something if it bothers you”, realize that he doesn’t know that I know they exist. And I really don’t want him to know I’ve seen them.

So my questions for you ladies: 1) am I crazy and should I just forget about it? And 2) if I approach him about it, how should I do it?

Please be nice, but I’m up for valid criticism and mostly just civil conversation around the topic/your own experiences.