I apologize that this was so overdue... I've been busy lately.
Ulfric:
Ulfric can be a very envious man at times. Most of the time he is jealous of his soldiers' casual but harmless flirts to you, and other times it is Galmar. You love Galmar as a friend, but sometimes he sees it as more than that. Ulfric shows signs of jealousy by shutting people out, and becoming extremely moody.
Ralof:
For the most part Ralof has gotten over his jealousy, though he won't hesitate to punch someone because they were staring at you. Ralof was very envious when he was younger. The day you first moved to Riverwood all of the boys wanted you, Ralof especially. Ralof often picked fights with Sven and Faendal that were over you.
Hadvar:
Hadvar is a very simple man, and can understand that you hate when he's jealous. He often never feels jealousy, and if he does, he'll just shrug it off. The only time when Hadvar gets truly jealous is when men are being absolute pigs to you, and he won't wait to show them their place.
Farkas:
Farkas could care less about other men. All he knows and trusts is that you're faithful to him and will never leave him for someone better. Enough said.
Vilkas:
Vilkas gets jealous easily, though he doesn't like to admit it. However he respects his fellow Companions if they are close to you, but still will feel jealous. He'll refuse to talk to anyone and will become angry easily if Vilkas becomes angry.
Brynjolf:
Brynjolf is very jealous. If he catches a single man glancing at you, he will deal with it. He also will not hesitate to punch a fellow guild member in the face if necessary. Brynjolf does small things to show his large jealousy such as proving why he's better, wrapping his arm around your waist, or even stealing a quick peck.
Ancano:
Ancano is the definition of jealousy. He snaps at you and becomes moody if he's jealous. Ancano is surely the one who takes jealousy too far, by threatening the one who is around you or flirting with you. You do admit, Ancano is quite adorable when he becomes jealous of others.
Onmund:
Onmund distances himself from you when he becomes jealous. He'll watch you from a corner in silence, and plot of ways to gain you back. Normally, he fails with a cheesy pick-up line or some romantic thing.
Cicero:
Cicero doesn't actually realize when other's are flirting with you that often. It's not that he's stupid, he just doesn't understand it that well. However when he does realize it, it will bring out the overly protective and angry side of Cicero.