Spend more time with him. If you know they're gonna go out somewhere just ask him if you could tag along, he'll probably say yes since you guys are best friends. If he says no then ask him: "where are you guys going anyway?" Then bring another friend a long with you and "coincidentally" bump into them.
she is jealous of her or him
Date the guy your best friend likes.
Talk to your friend who is jealous and tell her how special she is and explain to her why both her and the other friend are important to you. Also make sure you treat both of them the same way and that you don't show a preference for one.
I usually know it by how they act or react and also by observing your best friend's facial expressions when you talk about that person. You could also ask your best friend about it.
If your best friend tries to make you jealous and she pushes you out of things and doesn't want to go out of town with you but still goes with other friends, then she is not a good friend. A good friend will not hurt you that way. You should talk to her about it to see why she does it.
The best friend sounds like she is very possessive and jealous of her friend forming new relationships. This is dangerous and perhaps the friendship should end completely.
Your friend should not be jealous enough to endanger your friendship. But you can let him/her beat you at something to help cool down the friendship.
u r in to ur best friend and like like him/her or possibly u just envy them
date her BEST friend.
maybe he/she is jealous of what you have
Selena is Demi's best friend, why would she be jealous of her? What kind of a question is this, they are best friends, they cant be jealous of each other!!!
Beck did not get jealous because Jade liked his best friend Moose. They were all friends and did not see it that way.