Getting over his ex

So this guy I’ve been dating for half a year just let me borrow his phone to use Instagram, when I went to search up an account his ex was the most recent search. We were in the middle of a fancy dinner so I didn’t want to ruin the mood but honestly it was a buzzkill. They broke up a year ago so I would’ve thought that he’d move on and He says he has. Should I bring it up? Move on? Like everything else is fine but that’s been stuck in my mind