It makes total sense. To be embarrassed is normal. To feel unsafe and helpless also. We all feel like fools that we didn't see this coming. But keep in mind that you are not guilty for his actions. Right now you are asking yourself what you did wrong that produced his cheating.It doesn't matter if we were having problems in our marriages, it's not an excuse for cheating. You will learn that we can only be responsible for our own acts. The first reaction is to try to fix things right away.It will not happen, as you were told before it will take one step a time. The how will be built day by day. Think of this as crisis management. You have to make damage control and after you've done it you will be able to address the real problems. Take my example, I thought that just by asking him to stop right away, he would. If he had done it by then I wouldn't have the current trust issues because I could accept it just as one slip. Didn't happen. This animal has its own time. It's OK to have someone you can confide to but take your time before you tell more people of your acquaintance. You will feel better after your C appointment I am sure.