Could anyone help me understand the dynamic with a guy?

So we were onn and off for 10 years. he was the first to chase me as a 17 year old and he got rejected everyday for a whole year. When I went back 4 years later to appologize, he treated me poor and acted like we dont know. So i moved away. Now he got in touch with me but I ignored. he kept asking if I am single. He was pestering multiple times to know this with constant texts and calls. I told I am single and then he relaxed but still pursued.

So I told him I 'just'wanted to know him (his intentions) and he replied 'I am emotionally unavailable'. i told him that Im also emotionally unavailable but want to know where it leads to. I dont know what his intentions are but I cut him short.

Now we work together. I always see him looking at me, trying to talk to me and low key jealous when I talk to other boys. But I ignore him the best.

I dont know his intentions.

Could anyone help me understand the dynamic with a guy?
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