Kè grenn

Kè grenn → expression for jealous (as in: covet, green-eye, envious)
the word "Kè" → heart
the word "grenn" → (in this expression) might have originated from the English word "green"

Kè ou grenn → you're jealous.
Kè li grenn → He/she's jealous.

*You cannot use the expression kè grenn to translate jealous (as in being protective)
_____________________________
another way to say "jealous" in Creole is jalou or jalouzi
Jealousy (n.) → jalouzi
Jealous (adj.) → jalou
To be jealous (v.) → fè jalouzi or jalou

Examples:
He's jealous. (three ways to say this in Creole)
Li jalou.
L'ap fè jalouzi.
Li gen kè grenn.

I'm so jealous of you.
Mwen jalou.
M'ap fè jalouzi.
Kè m grenn.

I'm so jealous of you!  I wish I was the one going to Paris.
Kè m grenn wi!  Mwen swete se mwen ki ta prale Pari.

He is a jealous man.
Li jalou.
or
Li se yon nèg ki jalou.
(Can't use "kè grenn" for this translation :)

She's being jealous.
L'ap fè jalouzi.