While I think that Steve could probably be a little possessive and jealous when it comes to Eddie, for the most part, he knows Eddie's his and he's not stressing too much BUT
Eddie Munson is undeniably a jealous little shit. He's giving Nancy his best side-eye every time she gets close to Steve, god forbid she actually touches him.
I think Eddie would, like, hiss and puff up at her. He's an angry little kitten over Steve because that's his boyfriend. He glares at the old ladies who coo over Steve at the grocery store. He huffs whenever one of his friends makes Steve laugh a little too hard.
He tells Jeff to back off because the man offers to help Steve with something one freaking time. Jeff is straight. Eddie's not taking any chances.
He'd rant to Robin that 'Nancy had her chance. She needs to back off my man' and complain to Steve about how touchy those old ladies can be.
It's a hand on Steve's back or arm anytime they're around other people just so the message is clear: this man is off limits. He is taken.
