Another Song Question

Ive seen this movie multiple times (most recently last weekend)....and I have a song stuck in my head, and Im honestly not even sure if its from this movie or not.....(although this is the only movie I clearly remember watching this past weekend where I wouldve remembered this snippit from earlier viewings)....

Its a female singer, singing "i didnt really want you, but I want you", or something to that effect. It sounds like a lovey kind of song...Ive had that little blurp in my head for a couple of days now, and i dont know any of the rest of the song, so its driving me insane!!

Any help would be appreciated!!

Thanks
-A