Need advice on some photos

Hi ladies, so let me start by saying that I’m married and have 1 daughter and another on the way, my husbands camera doesn’t work so I regularly send him photos of our baby. Per his request. So I send him some cute ones that I want to place as his screen saver and I come across 2 photos of women on a bike, 2 ass pics(she’s wearing shorts and a mans hand is grabbing her cheek) and a woman’s Facebook, one girl on the bike is the one in the ass pics. He saved them all but deleted the ass pics. So Now I have to snoop. I open his WhatsApp and it turns out the photos are from a co workers group chat he is in, his co worker is the one who sent him these, fine I’m so happy he isn’t cheating but...why would he save them?? Why did he need to go back and look at them... I can’t decided if I’m angry or really sad...I’m going to confront him later when he wakes up... I just don’t know what to do!