my boyfriend and his ex

my boyfriend has an ex and we've never really talked about our ex's before but I know something's about her that he doesn't know I know anyways today we were laying down and I saw from the side of my eye that he was on ig and I saw his ex friend request him and he didn't know I was looking and he just said ew anyways I checked his following and it says he's following her ): anyways then later he was looking through her things and was like "omg I think my ex and her man broke up" and I didn't know what to do or say so I just stayed quiet and kinda got jealous now my point here is should I tell him what I'm feeling and that I got jealous or just get over it ???