Coexist, by Julia Crane, is the first book in a YA contemporary paranormal trilogy. It's a story told mainly through the POV of sixteen-year-old Keegan, the light elf heroine, although the story does show scenes from her brother Thaddeus, friends, and her Chosen (soul mate) Rourke.
The way Chosens work is that each elf has someone that's chosen for them when they're born (in a mysterious way that isn't explained), but they are not allowed to meet until they turn eighteen (it's also not explained who makes that rule). Once they're both eighteen, the Chosen bond flares to life, and they instantly fall in love and can sense each other from far away et cetera. At the beginning of the book, Keegan's learned Rourke's name, so every time she thinks about him, he feels it and can see of what she's doing. Of course, being a teenage girl that knows she has a perfect soul mate out there somewhere, she thinks about him a lot, so he's constantly being distracted by her and desperately wants to meet her, but knows he should wait until she turns eighteen.