Eddie doesn't get overly jealous since you're around his friends a lot and he trusts them, but it still annoys him when they flirt and are awed by you.
Eddie will just casually slip in things like "My girl is talented" or "That's my girl" to stake his claim, and you secretly love it.
He might even go as far as to wrap an arm around you, looking everyone in the eye as you lean agasint him, a satisfied smirk on his face as you snuggle closer.
Yeah, Hellfire Club definitely knows that you're Eddie's.