Why does he orbit around me?

Me and my crush stopped talking months ago. After almost a year of not talking he came to congratulate me on facebook about me getting a job.

He saw my facebook story update that I posted about me getting a new job and he replied to it.

me and him are barely even acquaintances and he didn’t have to congratulate me but he did. This is the third time that he reacts to my life event.

is he still thinking about me and wants to reconnect? Is he showing interest in me?
Why does he orbit around me?
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