Still Not Over You by Nicole Snow

Kenna doesn't back down from Landon the girl gives sass right back to him:
              “What?” He whirls on me, eyes blazing. “Eff. Why wasn’t that the first thing you told me?”
             “Well you sure didn’t seem that interested in having a conversation,” I shoot back.
Kenna sometimes has to put her foot down on some things, "...she’s clutching a blanket for decency. “Pants, Mister,” she says firmly. “I want my pants before we talk about this.” I liked this book, I loved Landon.