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Maybe he doesn't want to come across overly keen, he's probably trying to play it cool. Or, he could just be a really lazy texter! A lot of people read a text, and intend to reply quickly but then get busy doing other things and eventually you realise you never actually typed out your reply... I do that a lot.
If he's still dating you and initiating conversation he's still interested, just a bit lazy with texting :P which isn't always a bad thing either some people prefer face-to-face contact over messaging a lot