They are jealous because they are both insecure. This is something that comes from within each of them. It has zip to do with you and it is not neccesarily due to immaturity, as some of us can feel insecure until our dying day.
The advice rendered here for you to have a frank, non-threatening discussion with each of them, is probably the best route if you want to stay friends. Telling them to grow the fuck up will do nothing but hurt their (insecure) feelings, tho' it would probably solve your problem, as they most likely would tell you to take a hike.
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