Jealous

1. Apprehensive; anxious; suspiciously watchful.
2. Exacting exclusive devotion; intolerant of rivalry.
3. Disposed to suspect rivalry in matters of interest and affection; apprehensive regarding the motives of possible rivals, or the fidelity of friends; distrustful; having morbid fear of rivalry in love or preference given to another; painfully suspicious of the faithfulness of husband, wife, or lover.
4. Zealous; solicitous; vigilant; anxiously watchful.