why does my husband look at other girls online, is that normal?

yeah, this is really common, most guys look at stuff like that sometimes, it doesn't automatically mean anything's wrong with your marriage. but the fact it's sitting in your stomach and keeping you up matters too, that's real, don't brush that off. here's the one thing i'd actually do: just talk to him about it directly, not as an accusation, more like "hey i saw this and it made me feel kind of off, can we talk about it." see how he responds. a guy who gets defensive and acts like you're crazy for bringing it up is different from a guy who says "oh yeah i get why that felt weird, i didn't think about it that way." the response tells you more than the browsing does. don't sit on it alone all night, that's how it turns into something bigger than it needs to be.