Here is what I'm finding about the text messages. According to Nurmi, of course.
-he had to file a motion to compel the state to provide them because they refused
-the state kept insisting they didn't exist until threatened with court intervention
-state turned over "hundreds" of text messages. KN is angry they didn't come from the phone company itself, but rather from the state. He prefers the records directly from the phone company
-he finally got what he wanted; the fact that there were thousands and thousands of texts (gee, the page before said hundreds, now it is thousands) means to KN that these two "were really involved in each other's lives on so many levels." The number of texts reveals to KN that Travis never tried to disengage himself from JA (gee, Nurmi, if the number didn't perhaps the content would have. Dumba$$).
-KN says these were very genuine because they were written at a time when neither party would have a need to fabricate anything.
-KN focuses on the differing tones of TA's texts, how one minute he calls JA a liar and the next he says she is awesome.
-JA supported Mitt Romney for President (I swear, I'm not making this up)
-the texts on the whole made Nurmi feel very sad.
This is in the section about the text messages. The book is so disjointed the info you seek could be elsewhere so I'll take another look and post anything I can find.
But as you can see, Nurmi is looking strictly at the number of texts. God forbid he write about the content of them. I have a sneaking suspicion that would paint an entirely different picture of this "relationship."