Funny, my GCC was named Peanut. It's a bit of an uncommon name, isn't it?
As for jealousy, as far as I know (regarding IRNs, not too much...) I don't think IRNs are too jealous prone. However, it depends on the bird itself. Does your bird like you and no one else? Does it get along with others (humans)? When my Peanut met our other birds, she was curious about them but never really sought them out- she was far more interested in me.
If you do get a new bird, please quarantine it first. When we got our budgie PJ, we didn't and now I think it might be a factor that played in Peanut's death. Also, NEVER house two birds in one cage, unless they were brought up together/mates (even then, be very, very, very careful). A bird can easily kill another, despite the species. You would need an aviary to house two strange birds together, and even then it might not work. So it's much easier to get another cage.
When you feel very comfortable that one bird is not being aggressive to the other (over the span of a few months) then you might let them interact with each other. If you get a small bird, like a budige, then I wouldn't recommend letting them meet at all- IRNS have those really big beaks that could hurt a budgie easily.
And that's all I have to say for now, off the top of my head. Good luck with your Peanut!
Yellow-sided Green Cheeked Conure. Rest in peace, my Peanut.
Cobalt Budgie
Turquoise Lineolated Parakeet
