PTSD patients may suffer from nightmares, headache, dry mouth, muscle aches, repetitive motions, blurred vision, nervous tics, emotional withdrawal or even have difficulty in telling what is true and what is imaginary.On a date, your partner may become nervous, get irritated easily or look really anxious.
Signs of PTSD will not always show; they will only surface when they are triggered by a memory or even with a simple body gesture.
You need to take good care of yourself in order to take good care of other people.
You should get enough quality sleep, eat well, exercise regularly, hang out with friends, develop your own hobbies, and know your limits and let friends, family, support groups or professionals to help when necessary.
PTSD is a mental illness and when developed to some extent only professionals can help prevent really bad consequences from happening. They will talk with your partner objectively and tactically, and utilize all needed techniques to help one get over the traumatic past.
But know this, you can't force or coax your partner to accept therapy or treatment.