A YA book about growing up, loss, depression, family and friendship

I absolutely LOVED Ally Condie's Matched trilogy, so I was really looking forward to reading The Only Girl in Town by this same author. The chapters are very short, with some just being one sentence or a list of ice cream flavors. It took some getting used to, but it did add to the anxious tone of the book, urging the main character, July, to keep trying to figure out what happened to cause her to be all that is left in her town, as well as urging the reader to keep on reading. Through these short, but very descriptive chapters, the readers begin to see how her empty town is now and what lead up to this event, getting to know her family and friends in the process. July reveals regrets and longings and mistakes and hints that something tragic happened to get to where she is now. The themes of depression, anxiety, grief, growing up, loneliness, love and loss are explored through the experiences of a young woman entering young adulthood. The theme of being broken is also woven through the chapters--broken mirrors, broken hearts, broken friendships, broken minds. This book would have likely been a 5 star for me had the ending not been so vague, with no real resolution. Everything seemed to be building to a greater revelation, but then just sparse words with a sprinkle of possibilities thrown in doesn't create a satisfying end to a story that the readers have become invested in. Was it a dream? Was it the afterlife? Was it psychosis? Was it just teenage rumination, building a small problem into a big one within their mind? Or did something truly tragic happen that night? Sadly, I didn't find those answers.