What does it mean when a guy says "it's cool" when you apologize for something? I felt I texted him too much, he said "it's cool" was working?

Anonymous
He has said it to other things too, like when I do something I get stressed out a bit by he says "it's cool"?
What does it mean when a guy says "it's cool" when you apologize for something? I felt I texted him too much, he said "it's cool" was working?
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