Ex’s pictures… should I mention it ?

So my husband and I have been together for 5 years and some change currently expecting baby #2… we ran out of space on our phone so we send our pictures though fb messenger you ourselves so that way we can storage them there while we find a solution… the thing is I know he has some pictures I’d like to have as well so I went to see them and I say that we “saved” his ex’s pictures some where they’re together and some where its just her… I guess he didn’t think I was gonna find out? Should I say something ? I’m kinda numb right now…