Maybe #1 Maybe Someday (original) Colleen Hoover

At twenty-two years old, Sydney has a great life: She's in college, working a steady job, in love with her wonderful boyfriend, Hunter, and rooming with her best friend, Tori. But everything changes when she discovers Hunter's cheating on her--and she is left trying to decide what to do next.

Sydney becomes captivated by Ridge, her mysterious neighbor. She can't take her eyes off him or stop listening to the passionate way he plays his guitar every evening out on his balcony. And there's something about Sydney that Ridge can't ignore, either. When their inevitable encounter happens, they soon find themselves needing each other in more ways than one...