My ex has been calling me after our dna results?

For months my ex was denying our son. He told everyone my child wasn’t his and that i sleep with other men etc

So we got a paternity test and he told me that is wasn’t a need to get a dna test because he knew it wasn’t his child.

Finally our dna results came back and i showed his mother she told him the results and it proved this is his son. Now he’s been calling me back to back trying to talk but i have been ignoring him why is he calling me all of a sudden after i proves him wrong?
My ex has been calling me after our dna results?
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