Why does he do this? why does he even reply?

This guy i'm talking too is a very dry texter, I don't ask a lot of questions or give him a lot to continue the conversation on with, when I do ask questions he answer, he will also read my messages then respond later, but honestly I don't understand why he even bothers to reply? I've left him on read to see if he even bothers to reply. I don't understand why men do this, I've never come across it before
Why does he do this? why does he even reply?
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