I Used to Be Friends with Greg Heffley

I Used to Be Friends with Greg Heffley was a fictional book imagined by Greg Heffley in The Ugly Truth. Greg 

thought if he became rich and also famous in future, Rowley will write this book to also get himself famous. It's unkown if its going to exist or not. Since Greg and Rowley became freinds at the end of The Ugly Truth, it is not that likely to exist.