hey man,
I've had the same problem. I've met this girl at the gym about 3 to 4 weeks ago, got her number, txted her a few times. I just kept giving it breaks. Like if I txted her on saturday, I would then txt her the following saturday. Unfortunately for me, she's not interested. I did send her 2 messages(one on wednesday nite, and one on saturday) but never got a reply. Saw her at the gym yesterday, and she did apologies for not texting back. But you know, its either she falls in or out. For me, she fell out. So I am not bothered, just moving on...loads of girls around mate. Am sure you'll get plenty who will actually reply to you. Just be confident, fun and enthusiastic!!
