How much texting is normal in LDR?

So we have been in a relationship for over a month and we have been talking for a month before that. Now we haven't seen eachother in three weeks. We used to text all the time but now he texts me like three times a day and leaves me on seen for hours. And we dont really call eachother. Is that normal or is he losing interest? When I ask him he says that everything is great and that he still cares about me that he just has lot to do. But he doesn't really talk about his day, what he does...

How much texting is normal in LDR?
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