Its very difficult. Gather as many facts as you can over a long period of time. Most of the time spouses are sucked into their relationship and don't realize what they are a part of. Because of this you need to have enough information to look at their situation objectively and with a clear mind. In the meantime its very important that you don't show bias when speaking to your friend and also you should never imply that your friend is blind to his situation. Narcissists are able to control their spouses without actually showing their control. So although its obvious to you, it will seem ridiculous to your friend because he thinks he's in control of the situation.
In a nutshell:
Gather evidence, solid examples (for example, emotional blackmail, unusual behaviour)
Note down your friends reactions in these examples
Speak to him in a non-threatening or intimidating way, show concern but never challenge his abilities
But be warned, all of this can backfire on you and result in your friend thinking that you are paranoid and have problems, and not his wife.
Good luck.
A - How do you know they are narcissist? B - Why do you assume that the friend doesn't already know? C - Why do you think they might want to know? D - Is it any of your concern? If you can satisfactorily (and honestly) answer those questions then yes, tell the friend, otherwise leave the matter lie.
tell your friend about it if she doesnt believe you tell a teacher
YESSSSSSSSSSSSSSSSSSS
Tell him that the other guy is just a friend, and then, prove it to him, somehow...
Be careful if you do, the narcissist can be a monster to anyone who hurts their pride.
Yes -- the Narcissist will tell HIS/HER OWN VERSION of the truth and try to tell it first & loudest. Don't believe it.
You tell them... If you were true friend you would be honest with them. But if they don't believe you let them find out the hard way
tell her your side of everything and if she dosent believe you she is not a real true friend
Tell them that you don't and that your sorry if they don't believe you but that's the truth. If they still don't you can tell them that a true friend would trust you and that they clearly are not a true friend.
Tell your friend that you are not comfortable during those visits and talk together on where you two can spend time as friends instead. Maybe a meet at a bench in the park.
It's not best to tell him after a while so be straight and tell him
Yes. Otherwise they'll get deeper and deeper into it. At lease they have a fighting chance if you tell them.