Is this a red flag or normal?

I saw on my boyfriends instagram search bar that he searched up his Ex girlfriend from 10 years ago. They do have a lot of mutual friends. And they were following each other before me and him started dating just under 2 years ago. But after our first date he unfollowed her without me asking just to make me feel good when i explained my past. Ive never seen her in his search bar before. But is this a red flag?? His ex has 2 kids now and is in a relationship herself it looks like. He does hold a teeny tiny bit resentment the few times hes talked about her. They were 21, and she cheated on him with a guy. But now they’re both 30/31. He seems moved on butt idk i want to be cautious. (Hes never cheated)