Amazing song

I remember listening to this song at a party. Dont know the artist or the lyrics, just the story line. a guy loves this girl. he wants to take the relationship to the next level, but she wont. He thinks that she doesnt love him, but it turns out she had aids and couldnt have sex. Infact she wouldnt have sex because she loved him. It was a good song, any help would be nice. thanks