Why did my ex get jealous over something I did? Why does he care?

He dumped me. Messaged me, really mad, telling me not to do something again. He calmed down after I told him I only did it once. He then told me not to do it again two more times. After the first, in the span of days. Why does he still care?
Why did my ex get jealous over something I did? Why does he care?
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