Damon- Damon gets jealous of klaus because you and klaus are very close and you tell him everything that goes on in your life including with you and damon.
Stafan- Stefan gets jealous of you and Elijah because Elijah is like your big brother and he protects you in everyway possible especially when your arguing with stefan.
Klaus- klaus gets jealous of you and Damon because you and damon are sort of drinking buddies and he doesn't trust damon.
Elijah- Elijah doesn't get jealous that often because you made a promise with him to always be his and make no bad mistakes and he is a man of his word and he trusts you when you give yours.