Dude, post the text convo's in here. Probably, you have zero text game.
I used to number close a lot when I was a newbie. I started texting. Nothing! But in retrospect, this was usually, because my texts were pretty lame. I will give you an example.
I meet a girl on the dancefloor, do a little salsa, have a drink and a convo together. Ask her out on a date, she says yes: number close:
OLD ME: Hey, HB 7 it was sure cool to meet you. When would you like to have that drink. X Old me
HB 7: Hi Old me. It sure was nice talking to you. Next week I'm so busy, but lets text to make a date the week after
(obviously she will keep giving excuces a couple of weeks later, and eventually start ignoring my texts or giving friendly but boring responses).
New me:
NEW ME: How much do you weigh?
HB 7: huh? what? That isnt very polite haha why?
New ME: well, my toe hurts... I think you need to polish your salsa skills a little, I think you destroyed my pinky toe!

HB7: haha, I'm sorry!!!
New Me: Well I think a drink will be fine, but no more dancing! Too dangerous!
HB7: oh come on

You're such a cry baby.
New me: Well I try to be, my ex girlfriends always said I was a cold harted basterd. And they only loved me for my looks...
HB 7: haha you're crazy!
New me: Call me crazy, but I would like to meet up with you again, I am willing to miss a toe or two to be in your company

Wanna hang out this weekend?
HB 7. haha. Sure... etc. etc.
You see? Text game. You need to be GAMING HER WITH THE TEXTS! Always make sure your texts evoke an emotional response, preferrably laughter!
Hope this helps. If you need more advice, post some of your texts, and I can help you.