Is he not interested in me?

I always text my crush first. When i asked him why he don’t text me back on time or first, he said “ i dont have time i remain busy but whenever it’s possible or I am completely free i reply to your text because thats the time we can complete our conversation”. We only text once in a month. Should i move on or wait for him to develop his feelings for me?
Is he not interested in me?
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