Two informational/historical books exist that I know of. I will site them here, so that those who know little or nothing of CL may educate themselves, and that we might have better discussions here.
Courtly Love (Jeane Markale)
The Book of Courtly Love: the passionate code of the troubadours (Andrea Hopkins)
Courtly Love (Jeane Markale)
The Book of Courtly Love: the passionate code of the troubadours (Andrea Hopkins)