should I tell him?

The other day my bf was showing me something on Instagram and I saw a sexy picture of a girl in his feed. Well I didn't say anything to him at the time but now it's really bothering me. So I went on his phone when he was sleeping and looked at who he follows and there's so many sexy girl accounts! I just hit unfollow on them and I feel like I should tell him that this makes me uncomfortable but I just don't know how or if he's gonna be mad at me? Please let me know what you think! I know he's not cheating on me I just don't like him looking at other girls it makes me feel like I'm not good enough. Am I wrong? 😰😥
Update!
Well I talked to him in the middle of the night, last night and he said that he wouldn't follow any more accounts like that. I honestly couldn't sleep because I felt so guilty and bad about looking on his phone. We've been together for 4 years and this is the only time I've ever done anything like this. Thankfully he wasn't mad at me and he said he understood why I did what I did.