What's the adjective for jealously? Here's the word you're looking for.
jealous
Suspecting rivalry in love; troubled by worries that one might have been replaced in someone's affections; suspicious of a lover or spouse's fidelity. [from 13th c.]
Protective, zealously guarding, careful in the protection of something one has or appreciates. [from 14th c.]
Envious; feeling resentful or angered toward someone for a perceived advantage or success, material or otherwise. [from 14th c.]