Do you ever feel like there's just nothing to say to your BF/GF?

Is it possible to have "covered" everything to the point where you guys have just run out of conversation? My guy and I are slipping in the communication department. I'm a naturally quiet person, but I try hard to be chatty beacause he said he'd like me to be more open. He's very social and talks a lot and I'm just not as social and talkative as he is. Not that I was closed up, I just didnt talk that much. I worked on that and improved a little. Now, it feels like we've literally "run out" of things to talk about about. Have you ever gone through this and what are some GOOD suggestions to pick things up in the communication department?