Why would an ex boyfriend re-add you on all of their social media?

It's been a few years since I've last heard from him & things ended peacably. I'm just not sure why he's suddenly reaching out? He added me yesterday but hasn't DM'd yet.

We had next to nothing in common & if you were to compare our timelines, the differences have only gotten bigger.
We started seeing other people so we mutually cut ties a few years ago. Why the sudden change?
Why would an ex boyfriend re-add you on all of their social media?
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