The Fallen Series
Summary: a girl and an angel are in love but when they get emotionally close she dies and is reincarnated, never living past seventeen. The series goes through her discovering why this happens and potentially breaking the curse.
I recently finished this series over the past week. It's an easy young adult read, but in a good way. It still had me reacting to the story, even yelling out loud when I spotted a subplot result.
It does a good job of describing locations and backstories, there were side characters that had personalities that you could recognize when they were brought up, and it had just enough Nephilim lore that I recognized to fit in that section of young adult. It does have that typical 'high school' plot to have them meet in the beginning but it moves past it.
Sometimes young adult novels are too boring or simple but I liked this one.