A question about ear/jaw injury....?

... I did an absolutely horrible thing. My boyfriend and I got in a pretty heated argument recently, and I ended up slapping him pretty hard across the face (I am evil, I know) but when I did, his ear and jaw on the opposite side of his face started to hurt extremely bad. Its been a couple days, and the pain has not gone away, if anything it has gotten worse. Could I have seriously injured his jaw (broken, fractured) or ear (ruptured)? There was no blood at all, and I didn't hit his ear, or cup my hand or anything... will he be ok? What could be causing this excruciating pain?