Stefan- Damon, Stefan is jealous of Damon because he scared that Damon could take you away from him just like he did with Elena.
Damon- Kai, Damon is jealous of Kai because he knows that Kai is around your type.
Enzo- No one because he trust you;)
Kai- Pretty much everyone, he's very self-conscious and insecure so normally when he sees you with another guy he gets furious and sad:(
Kol- Stefan, Kol knows that you wouldn't do anything with Stefan because he's your best friend but, he still very jealous of whenever you hang out with him for a long time.
Klaus- Damon, Klaus is jealous of Damon because you hang out with Damon of time, i mean he is your drinking buddy so-
Elijah- Klaus, Elijah understands that he would never do such a thing like that but he can be insecure sometimes.
Tyler- Jeremy, because you and him used to date.
Jeremy- Everyone, Everyone that he is jealous and has everything you want in a guy, but some odd miracle happened and you fell for Jeremy.