Found it

My husband and I been married for 5 months and been together for 4 years. He has a kid from a previous relationship and his ex has always been giving us trouble and always trying to break us apart. Anyways, I was working out in the garage and always wondered what was in this big box. (He got the house before I met him) I looked thru it and seen a shoe box filled with pictures of him, his friends and his ex girl. I instantly got mad cause he never threw his ex pictures away. Is it wrong for me to dig through his things?is it stupid of me to get mad over this?