Antibiotics have removed the need for a ward given over to dreadful carbuncles and other sepsis. But the basic rule remains that where you have pus you let it out. Otherwise it festers and spreads. It is a hard thing to do and I confess to having failed in this. Or I have thought that I had adequately stated a thing to find that it was completely unclear to the other person, who was therefore still sore.
Manners can get in the way of clarity.
In the end the wound between you and your friend will heal better and more quickly if it is out in the open. I speak in all this as someone who has failed in these matters. We can thank God that we have a loving Heavenly Father who knows what we are like and forgives us. Let us follow the heavenly rather than the regal example in the whole matter of disagreement between Christians.