My friend’s ex is liking my every story or post on instagram - wdym?

Okay, so apparently they broke up like months ago, but i only got to know this like after 2 months. And like during that whole time until recently, when i took him from my followers he continuously liked everything i posted. So, just to say i didn’t tell her anything, because she is happy now with someone else and he def seems like the toxic person that can’t get over it. Now, my question is, they still follow each other and i don’t know if he likes everything she posts. But like, i met him max 3 times in a context of like we are all friends and stuff and she kinda helps me during university, like a mentor. Not even close friends put like in everything i post.

So, i am not really sure why he would literally do it, i didn’t tell her anything about it, because i knew the whole story and it was bad. No one noticed tho.

Do you have any insights on his behaviour?
My friend’s ex is liking my every story or post on instagram - wdym?
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