My ex won’t stop lurking on me and my friends’/family’s socials. At what point do I block/say something?

My ex and I broke up almost two months ago. It was a blindsided break up with no warning, prior communication, or clear reason why he was dumping me in the first place. A few weeks after we broke up, he blocked me on all socials (after posting a looooot about having a broken heart 🙄) and has since unblocked me, though we don’t follow each other anywhere anymore. This week, he’s liked all of my best friend’s instagram stories (my friend removed him as a follower shortly after), been viewing my sister’s tiktok frequently (she privated her account), and I’ve gotten follow requests from multiple burner accounts on instagram, all of which i’ve declined. I just removed his family from my socials this week as well, as they were interacting with my posts like we were still together (I have a feeling he hasn’t told anyone yet) I’ve been avoiding blocking him on anything because I don’t want there to be any reaction out of me from this unfair breakup, but are we now at the point where me and my support system need to block him everywhere? I’m tired of him lurking, and I just want him to leave me alone.