Waiting for You by Lucy Hudson

Lincoln Seabrooke has been focused on one thing: work. His devotion to his career has been the only thing in his life worth pursuing since the woman of his dreams walked away from him eight years earlier. There’s no one who could ever compare to her, so what’s the point of dating?
Charlotte Waters’ world is falling apart. She’s suddenly a single mom to twin boys, in search of a new career to support her family, and barely holding it all together. When a dream job lands her in the city of her ex, she thinks little of it. Chicago is a city of three million. And didn’t he move to California?
When fate crosses their paths again, it’s undeniable that the attraction is still there. But is the past too painful for them to find their way back to each other?