To some people apologies were easy, they came so readily that they just opened their mouths and said "I am sorry," To the person that they had wronged. Unfortunately for him. Derek was not one of those people to whom apologizing came easy.
It had a lot to do with his upbringing. If you could not throw money at it to fix it. Then it was not worth the energy needed to open your mouth and apologize. That had been how he had been raised, and Derek had never seen it as a failure. Afterall showing that you were feeling sorry. That you had even the slightest bit of guilt, could easily be turned into something that was lifelong servitude. He had watched his uncle do that several times to different people over the years. You gave him an inch, he took the whole arm. Being apologetic, genuinely apologetic, was not a good thing in that world.