From my forty-two years of experience I have found that we all (men & female) react to hurt emotions just in different manners.... Men tend to become angry or shut down completely and Women tend to cry or shut down by walking away to sulk.

And while they both (men & women) are doing different things in order to cope with the information they have just heard... they are both showing that they care about the other person or they wouldn't be acting in such a manner.

Please keep in mind that not all adults come into a relationship having the proper communication skills required and some times it is up to the more mature person in the relationship to help the other one learn... with love and patients at all times.

BTW - to answer your question WHY
1.) Men become angry when emotionally upset
2.) Women cry when emotionally upset