Proverbs 27:6 "Faithful are the wounds of a friend; but the kisses of an enemy are deceitful."
A true friend will always be faithful, even when their words hurt. Often they're the only one who will tell us the truth. But the level of friendship may change, and our friends will change over time - yesterday's best friend may not even be on next year's Christmas card list! Praise the Lord that HE is always there for us like no other friend could ever be: Proverbs 18:24b "...there is a friend that sticketh closer than a brother." And, HE will never change.