Very interesting. I am typically a KJV guy since it is what I grew up with and has, in my opinion, the best study tools available and is usually spot on in my opinion. But I am not sure that the context makes the most sense in the KJV here after looking at the interlinear and a few other translations. It seems there is some disagreement about the Hebrew words translated in the KJV as "must show himself friendly". They are very similar. Here is the translation that seems to make the most sense to me.
A man with many friends can still be ruined, but there is a friend that sticks closer than a brother. OR A person who has friends may be harmed by them, but there is a friend who sticks closer than a brother.
I guess in my own words it seems to carry this meaning, friends are not a good substitute for the one true friend who sticks closer than a brother. Many who you call friends may fail you or do evil to you, but the one that is closer than a brother will not do so.