Jealously is always born with love but it does not die with it.
Francois De La Rochefoucauld

Jealousy is all the fun you think they had...
Erica Mann Jong

Love may be blind but jealousy has 20-20 vision.
Source Unknown

I had rather be a toad, and live upon the vapor of a dungeon than keep a corner in the thing I love for others uses.
William Shakespeare 

Jealousy is indeed a poor medium to secure love, but it is a secure medium to destroy one's self-respect. For jealous people, like dope-fiends, stoop to the lowest level and in the end inspire only disgust and loathing.
Emma Goldman

The ''Green-eyed Monster'' causes much woe, but the absence of this ugly serpent argues the presence of a corpse whose name is Eros.
Minna Antrim