Do guys not think common sense?

So I’m dating this guy I first met a while back at a family gathering. I’m 21 and he’s 31. We started talking November and started dating this month. He’s never hid anything from me and I knew from the beginning he was previously married but at first I didn’t think we would be serious (I thought it would be a one night thing) lol. Anywho, he still has all of his ex-wife stuff in the house. I mean EVERYTHING... all of her clothes and daily essentials. Before I thought well I’m not anyone to tell him why or what is that stuff still doing here? Now I’m starting to think if it’s ok to bring it up or give it more time? Since we are in a relationship and it’s a little more serious vs just hooking up. Heeeeeeelp, how can I bring it up without sounding so crazy or controlling? I’m just curious? They’ve been split for about 2 years.