In Noel Coward's 1925 play Fallen Angels the last stanzas of a song
called Meme Les Anges is quotee Je t'aime, Je t'aime, Je t'aime.  What
is the song, composer and where might the sheet music or a popular
recording be found

According to this German site, the full name of the song is "Même les
anges succombent à l?amour":

http://www.felix-bloch-erben.de/index.php5/cid/1/
sLetter/G/pid/898/stueck/Gefallene+Engel/Action/showPlay/fbe/101/

I've found no trace of a song by that name. It is, of course, possible
that Noël Coward made it up.