Relationship texting lull

Hi Glow Community!

So I've been dating this wonderful guy for 3 months now. When we first started talking, we could text wayyy too late into the night, and it was laugh out loud funny, it was sexy, I loved it. (This was in addition to meeting up a few times per week, talking until late, lots of making out, etc).

Now that we're officially a couple (we've talked about it) we still text quite a bit per day, but it's become much less frequent and so much more mundane. When I meet him in person we still have great conversations, but I get the feeling he purposely waits to text me back some times now.

How can I put the spark back into the periods when Im not with him? I miss our ultra flirty texting time :(