They Just Don't Get It. Part 2

What do you do when people just don't get it? I guess what I'm saying is you have a confrontation, a falling out, or a fight and then the person you have the problem with acts like nothing ever happened.  What in the heck do you do?  Do you move on like nothing happened or do you bring it up and try to work it out? I've had one of those situations and not really sure how to deal with it because I'm not okay with acting like nothing happened.