Why would a Guy reach out to me again if he’s not interested?

I hired this guy for a job a year later he reached out and asked for my number I gave it to him and he only text me once a day or every few days. after about 6-7 weeks I cut him off I haven’t spoken to him in 3 months but recently he commented on my ig food photo and reached out. when I replied to his message it took him a week to respond why would he reach out again if he’s clearly not interested?
Why would a Guy reach out to me again if he’s not interested?
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