We all screw up our relationships with friends and family, even though in some cases we ourselves are not the ones to have started it. We make it worse by reacting or sometimes even overreacting to it, and bingo - an endless argument of accusations ensues - forgotten events are brought to life, past hurts are all dug up. Not only that, discussions begin (call it gossip, if you agree) with others trying to gather opinions, satisfying ones own curiosity and the need to reaffirm that 'I'm right'. Blood boils under the skin, hate slips out of control attempting to find any new way of manifesting itself and give back the other person what s/he deserves...
In all the process, many at time, the prime issue loses focus, and our thoughts become so extreme that words and actions start targeting the person and not the issue. That certainly will not only ensure that the issue is not sorted but also the relationship is destroyed. At times the hurt a closed one causes may be so great that you just cannot think of anything else at all. After some reflection and personal experiences, I believe one should hold themselves back from reacting to it immediately. If required sleep over it even for days till one's ready to handle the situation with a cool avoiding any bitter confrontation.
However, it all depends on how much value you attribute to the person and a relationship, and whether or not you want to save that relationship. Similarly, there may be many other variables attached which need to be considered. At the end, remember, everything is personal! If you will, you will!
In all of this, "It takes less time to do a thing RIGHT than it does to explain why you did it WRONG!" Take the first step, it's hard to say sorry, but do it. I've done it, so, I'm sharing it. It's much better, try it. Mend your relationships!