In order to help Someone who suffers from PTSD, you need to understand what PTSD is. It is also important to make sure to not take their behavior personally. Even though you might be seeing different behavior in your relationship, these changes are most likely symptoms of PTSD. Most people who suffer from this disorder have a hard time sharing there feelings, therefore they end up distancing themselves from others.
Click here to read the full article on HelpGuide.org.