What does it mean when she ignores your text messages?

I bought a second cellphone just to make sure I can receive all her text messages, I take that cellphone with me everywhere and would check it 1000 times a day for any texts from her, I send her everyday but rarely getting replies because she says she is busy. what I know is that she sends texts to her colleagues, family and friends at any time of the day, does that mean that I'm crazy about her and she is not the same with me, as simple as she doesn't feel the "need" to reply to my messages... or is she just playing some kind of games with me, is there something I can test her with to know why she treats me like that, or it's obvious that behavior means you have no respect or caring whatsoever for the person that sends you text messages?

p.s. we have been together for a descent amount of time, but living apart