An Abundance of Katherines by John Green
When it comes to relationships, Colin Singleton's type is girls named Katherine. And when it comes to girls named Katherine, Colin is always dumped. Nineteen times, to be exact.
On a road trip miles from home, this anagram-happy, washed-up child prodigy has ten thousand dollars in his pocket, a blood-thirsty feral hog on his tail, and an overweight Judge Judy-loving best friend riding shotgun - but no Katherines. Colin is on a mission to prove the The Theorem of Underlying Katherine Predictability, which he hopes will predict the future of any relationship, average Dumpees everywhere, and finally win him the girls