supernatural YA novel, girl who destroys everything she touches, boy who can heal

[twinkie_16]

okay so long shot, I can remember a lot about this book (except the name, HA) so here it goes:
- highschoolers
-girl is a loner who wears gloves so she doesn't touch anybody as everybody she touches becomes covered in boils
-popular boy who can heal
-loner girl finds out his secret when he brings a dog who was run over back to life (might be loner girls dog, cant remember)
-popular boy going out with popular girl who turns out to have supernatural power that lets her make people fall in love/do what she wants
-popular girl eventually uses this power to make popular boy do something he doesnt want
-popular boy and loner girl fall in love (duh)\
-turns out popular boy, popular girl, loner girl reincarnations
-in past lives popular boy and loner girl always cursed to never end happily ever after
-cue back to present, popular boy gets shot as popular girl incites town to lash out at couple? (hazy on this part but I'm pretty sure he gets shot)
-ends with loner girl going Carrie on town (killing people left and right)
-somehow popular boy comes back to life
-hazy on how the book actually ends


so yeah if anybody knows, please enlighten me