Am I being crazy?

Okay, I'm such a chickenshit, so I'm posting anon. I feel crazy and immature but I can't seem to shake this feeling. So I'm 22 and my husband is 29. Yesterday I went to attempt to get Xmas decorations from the shed and on one of my boxes there was a bag (that I've seen before and seen him go thru before but never really explored further) that I knew was my husbands. I could barely lift it! So I ended up looking to see what's inside and there was folders and baseball cards, and old family pictures! So adorable! So I kept looking! Towards the bottom there's more and there's pictures of his old girlfriends. And literally love letters written to him from the girlfriend he had before me about 4 years ago, along with pervious and high school. I know this seems immature but I feel kind of upset by this because when me and my husband were just dating, he got upset with me for keeping things that my prior boyfriend had given me. He has never come off as controlling and it wasn't a huge deal to me so I just got rid of the things (jewelry box, some heart jewelry, flowers). Since I've discovered this I've had a real tude and he knows it but I'm keeping my cool. Like I said, I feel like I'm being over emotional but still feel annoyed by this. Should I bring this up to him? Or just forget about it? Or get rid of the things myself?