There's no deeper reason. They never speak to each other, Kaleb isn't even in like half the book, he rapes her like it's going out of fashion… even when we get a chapter from his perspective, it's evident he feels nothing for the heroine besides a vague physical interest in her.

Is there a Kaleb POV in credence?

The majority of the book is in Tiernan's POV and we see how she views the guys. Some chapters are from Jake and Noah's POV, but Kaleb? Nothing.

Who does Tiernan sleep with in credence?

The girl (Tiernan) has sex with her step-uncle Jake first, then step-cousin Noah, then other step-cousin Ka. Girl's parents commit suicide. Girl is placed under care of her father's stepbrother, who lives in the mountains of Colorado with his two sons.