Ok. So whenever I get a girls number ill text her. And for about a week or 2 she'll show ioi's but then the ioi's go away. I text them every other day just saying hey and sometimes they just stop replying after awhile. And my question is, how can I text girls, and keep the attraction I built when I met them in person. An I just boring?

Stop texting. Start calling.

If you already have her number, you already have mutual attraction established. You should be building comfort and rapport with her. It is EXTREMELY difficult to continue building comfort with someone through a text message. People like to hear a voice. This is the way that she can feel as if you are in the room next to her. Guys will rationalize reasons to text a girl like "what if she doesn't remember me?" or "what if I sound nervous?"
Its a similar feeling to approach anxiety. You've gotta realize that girls give out their phone number to pretty much anyone these days. They know they can blow you off. She's probably got 100 different guys texting her (depending on her caliber of course... but either way, I'll bet any money that you are not the only one) and you want to stand out from the rest... Women see a man who is too afraid to pick up the phone and call her for a date as INSECURE and AFRAID... Therefore, you won't get a date.

Try this as an opener and you will see for yourself "Hey guys... phone or text?" and watch the responses you get. You will see for yourself.