The title of the song refers to the last words Monteith said to Michele, reported the magazine.
"Was just a week ago you said, 'I love you girl,'" Michele sings on the track. "I said, 'I love you more,' then a breath, a pause, you said, 'If you say so.'"
Monteith, a B.C. native, and Michele were also costars on the hit TV show "Glee." A tribute episode aired in November.
The song will appear on Michele's debut album, "Louder," which is set to be released on Monday.
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