BF's suggested search is his ex's account

Basically what the title says. He said he's never stalked her or anything but her account always pops up as a suggested search on TikTok and suggested DM on Instagram.

He also made a point that he's been blocked since they broke up last year so my argument does not make sense in the first place.

For context: we also had a fight like this with MY account where my suggested DMs on Insta is his friend's account, but I told him I've never talked with his friend and it's just my algorithm being weird. I also never stalked that guy.

A few days back my bf also saw my ex on his TikTok suggested accounts indicating that "(my ex) is followed by (my acc)" even though I don't follow him.

I just have a feeling he still stalks her behind my back.

For additional context: I stalk his ex a lot admittedly lol and he has my accounts logged in on his phone, idk if that mixes up the cookies