It could be a sign of increasing trust in each other. Ever think of it that way? You don't have to stay in constant contact because you know that eventually, at the end of the day, you'll have a nice time to chat.
Don't be that guy who demands every moment, every thought, from his g.f. throughout the day. That gets really annoying.
When you see each other, do you have a good time together? Nice laughs, you both enjoy doing the same things, feel comfortable together? If those things are there, then I'd say you're doing well.
