Ex boyfriend liked my post. What does that mean?

I've been no contact with my ex almost a month and last night he liked my FB post which wasn't even about him or anything related to our relationship but a random post for another person. I was surprised because I hadn't heard from him for about 3+ weeks at all other than he posted some sad love things for me which I totally ignored and never liked. And now I got this.
What do you think it could mean?
Ex boyfriend liked my post. What does that mean?
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