2nd Song at Party

hello, I was wondering if anyone knew the name of the second song at the party. It's a slow song, Olly is sitting in a chair and Sarah is dancing by herself. She then tells him she had a great time and she should go. The lyrics I think I heard are: complete me...cause I've offered you the part, complete me don't let go.
I've tried to google the lyrics but with no luck. ALso, I checked out the prvious post with the songs listed at the end of the movie, and it doesn't seem to be any of them. Any help is much appreciated.