He is just to needy or I am overreacting?

I am talking to someone who lives in France for a while. I live in another country, we were classmates before he gone to France.

We are communicating via WhatsApp but he always ask why I am taking time to reply when I took 5 to 10 to reply to his message but I do reply the fast when we have a discussions. I do work but I always explain to him that I can't reply as fast I see his message every single he sends me a message. Sometimes he takes time to reply to me but I don't ask him why he takes to reply. He feels like I am doing it on purpose taking time to reply.

What is your thoughts? I am sick of explaining myself and it's a turn off. I think of stop talking to him for good.

He is just to needy or I am overreacting?
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