What does it mean when my bf’s ex likes all his posts?

So they broke up six months before we started dating, she broke with him by blocking him on everything without saying anything (according to him) he says he didn’t really like her and was kinda forced into the relationship as they were the only young people in their church so he didn’t mind.

I’ve noticed that she likes every insta post he uploads and has been for ages. He doesn’t follow her but she follows him and a few of his friends. Do you think she’s trying to get back with him? The problem is i don’t know what he’s doing on his end. Am i overthinking or is this a little dodgey?
What does it mean when my bf’s ex likes all his posts?
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