Boyfriend likes other girls pictures?

So my boyfriend and I have been together for about 6 months and I'm in love with him, and I'm pretty sure he's in love with me too, even though we haven't said it yet. But that's getting off track 😅 My boyfriend likes a lot of other girls pictures on instagram and has a lot of girls on snapchat. He doesn't snap them or anything, just watches all their stories. I trust him fully, and I don't at all think he's cheating, but just the fact that he does that bugs me. How do I tell him that I have an issue with that without sounding controlling or jealous? Even though I think I may be a little jealous, I just don't want to make a big deal out of it. I'm not wrong to be bothered by this, right?