It's weird how some people find it so difficult to say sorry. Yet, make a mistake so easily. If it is that hard to just apologise for something you did wrong, then don't do it in the first place. Bad temper, strong pride and all other shit are just a pile of excuses to hide your shame.
It doesn't hurt to not hear your friend say sorry. It is disappointing to know they just can't bring themselves to do it. I guess maybe everything is about "Get used to it."