Hi all. I'm looking for a shoujo manga I read in 2006 that I got from Barnes and Noble. It has some angel and/or magical girl in it who has a secret angel/goddess identity no one knows about? It's also heavily romance-focused. The cover has a pink background and she is on the front.

Could it be Kamikaze Kaitou Jeanne?
I didn't read it, however it might fit your description. 🙂

Card Captor sakura?
Wedding Peach?
Full moon o sagashite?
Alice 19th?
Pichi Pichi Pitch?

Hopefully it is one of these. At that time there were way too many magical girl shoujos out there and a lot of them were licenced as well -.-