This is probably the kind of thing that needs to be addressed delicately. The more time he spends with you the more he's probably going to be able to figure out you aren't exactly rolling in it. Hopefully this won't be much of an issue and he's going to love you for who you are. Now his parents on the other hand....
6 months ago, I was notified by a friend that some girl was trying to contact me on twitter. I had a twitter account that I had set up many years ago but never used it. So I go log in and this girl had messaged me asking if I my boyfriend and I were married. I told her no but said he is my boyfriend (I hate saying that because it seems so silly at my age). She immediately posts that she is heartbroken. It wasn't directed at me, but since I could see that she had just created the account and the only questions she had asked were to my friends and to me, I wondered what she was talking about. I wasn't thinking anything of it at first because I trusted my man. So I text him and ask him who this girl is. He tells me he doesn't know. A few minutes later, I tweeted to her again asking her who she was and how she knew my man. She responds by telling me that she can't talk to me because he threatened her... told her he would make sure she lost her job if she talked to me. I told her that couldn't happen, to just tell me what's going on. I tried to get her to talk to me in a more private setting on FB but she told me that he had blocked her from my fb account. I thought she was lying until I went and looked at my fb and realized that she was in fact blocked, and I know I didn't do it. Shortly after that, I get a message from my bf on fb. It said something to the effect of "ha ha, you have been hacked". By this time, my stomach was in knots. Something wasn't sitting right about all of this..
humena humena humena.
I agree with CC12, it's time to back down. I wouldn't call or initiate contact. When someone pulls away it often triggers a "chase" response in the other. I don't really think of it as game playing as much as I think of it as giving her an opportunity to realize that she likes you. Nothing kills attraction like overeagerness. I don't know why, but unless you are both on the same page at the same time it's best to pull back after she's said she's not sure..