Boyfriend wont answer my calls or text. He never does this unless he's mad but we haven't argued. What should I do?

Let him calm down. Apologize if you think you did something to anger him. Explain you feel he is upset & wish to talk. Then wait for him to respond.

I have learned thru years sometimes they are feeling guilty for something they have done so they will not talk to you and ignore when you try and contact them

I'm going through the same thing unfortunately. Check to see that he didn't change his number. If you have no idea why he would do this, and if you know his number hasn't changed, then I would text or email him to let him know that you have been trying to reach him and that you don't know why he is avoiding you. Tell him you feel hurt and have no choice but to see this as a mean and immature act unless he gives you an answer. I would also think about whether or not you really want to be with someone who would hurt you in this way. It shows no respect for you or your feelings. You teach people how to treat you by what kind of behavior you accept from them. If you beg and act desperate, you are giving him all of the power in the relationship (or non-relationship at this point). If he doesn't respond to your text or email still, then you have your answer. If it lasts more than a week, I would not stand for this treatment. Any mature person would have told you that they needed some space so that you would not be left wondering or worrying. Unfortunately, I've experienced this a few times and these type of immature people never change and are not worth giving them any more chances. It will only cause more heartache. He is showing you who he really is. Believe people when they show you who they really are.