Being the voice of reason is hard when people have selective hearing. Usually straight forward will tell a person. Whats up and not tell them, what they want to here because as a friend you

Don't lie to your friend.
Being honest should be the best feeling because you don't have to remember anything. People who lie end up having to be, or act like someone they are not.

Never understood, how a people date when its one sided; meaning one is all in giving love. While the other waiting around till something better comes along. How and why are partners jealous of one another, instead of trying to function as a unit. Never understood the relationship concept being the 3rd wheel around certain couples.