Sunfire
Funny, I usually have it the other way around where my SO gets jealous cause of my friends. Well, what I’d do is try to make some time to hang out with her/him or at least catch her/him on instant messenger/facebook and just ask them how they are and stuff. Basically, I just want to let them know that they are still part of my life, and just because I have a SO doesn’t mean we’re not friends anymore. Sure, I will probably be spending more time with her and less time with the friends, but it’s just something he/she has to understand. If not, then they really aren’t your friends.

ChakGahk 
Meh, I don’t know, go away!  Actually, I just think this question is kind of vague… what exactly do you mean?  Your friends are jealous of your s.o. because of the attention they are getting?  The time you’re spending with them?  Is your friend secretly in love with you?  Or is it just jealousy ‘cuz you’re getting some?

SweetTux
I think you should let all your friends have a go with your SO in the bedroom! Afterwards, you can tell them to stop being jealous and let you enjoy your life. If that’s not your thing then you can have a big orgy! Haha.. Anyways, in all seriousness… I agree with ChakGahk that you need to be more detailed in your question. Have you ditched your friends or whenever you hang out with them, you must bring your SO around? The answer all depends on what is going on for them to be jealous of your SO.