Is he not interested or am I just impatient?

I messaged him yesterday expressing how I feel and he did not reply until today when I texted him again although he replied immediately after. He apologized and explained that he was really busy and that he would reply as soon as he is done with what he is doing. I honestly don't want to spend time pursuing someone who is not interested in me.

Is he not interested or am I just impatient?
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