Is it weird or a redflag that my boyfriend refuses to delete pictures of him and his exes? He doesn't actively look at them, he just has them.

He says it reminds him of his "younger times and good fun he had" and literally said I can break up with him if I have a problem with this.

I am 100% he is not cheating on me and he has absolutely no contact with his exes, he is a massive open book - no passwords on his phone, lets me use his phone and his social media accounts without any second-thoughts, he is not hiding any communication from me. Which is how I found those photos.
He is not even in touch with his exes, not even following them - "they are probably dead or married with 3 kids now, idk I don't care" he said once.

99% of the time we are spending evenings together and every single outing with friends I am always with him. He actually makes sure I come along with him. Sex is great too, we fuck almost every day and we have been together for 7+ months at this point.

I am just wondering if I am overreacting a bit? Yeah situation is a bit weird but besides this he is so fucking perfect.