Some advice please....boyfriend issues

I have been with the most incrediable guy for about 16 months. We do lots of fun things together, include the kids as much as possible, ect. We have even discussed going further in our relationship, sounds good right. He's the guardian of two half-brothers, and I have one kid.(a boy) However, when I was putting away some of his laundry(yes, we help each other a lot-even with laundry), I noticed that he kept all the cards and notes that I have written to him(sweet huh?). But here's the clincher, when I decided to go thru them, just for sentimental reasons, I noticed that my notes/cards weren't the only ones he kept. He had been keeping ones from a women he dated prior to me, along with the ones I gave him. In other words, they were all mixed up together. So, what would you do? Say something? Leave it alone? I know your thinking I was being noisy, I really wasn't, he knows that I have put away his stuff before. And he has always said that 'he has no secrets'. But I can't help but wonder if he hasn't 'let go' of the previous women? Is that why he's keeping the notes and cards? So does anyone think I'm overreacting? Being paranoid? Could use some constructive advice please. Just no tounge lashing. Thanks