What does his inconsistent behaviour mean?

We're both early 20s. There's a guy i've been dating for about a month now, i've noticed when we're together things are great and he seems really interested in me, but when we're apart his texting and general communication is VERY inconsistent. He used to text me every 1-2 hours when we first started talking but now i'm lucky if i hear from him every 24 hours. We have a date planned for this Friday which he says he's excited about so he enjoys meeting with me, but its as if when we're apart, which is the majority of the time, he's ignoring me or disinterested- he says he's still interested though. I know he's the type to go on his phone often so im just left very confused.

Why do you think this is? Thanks.

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Also, we've been taking things slow so haven't had sex.
What does his inconsistent behaviour mean?
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