Maryjane, how long has he been in treatment for his PTSD? If it is not a very long time, his PTSD will still be very unmanaged. And, if he is self-medicating with drugs and alcohol, it will be making matters worse. Living with a PTSD sufferer who is not managed is infinitely more difficult than being with one who is working upon themselves.

He is not using his PTSD as an excuse. PTSD is a very serious illness. Imagine if he had cancer and was very ill as a result... would you then expect him to support you emotionally even whilst very ill? Would you blame him for having cancer and not having the energy to support you? Or would you take his cancer into consideration and be especially kind and compassionate, regardless of his mood? PTSD is really no different, it is every bit as serious. I am not saying this to make you feel badly; far from it. Only that you do need to grasp he is ill and would not be treating you as such were he not ill. That is a very important step, once you grasp that is it an illness, truly grasp it, you have half the battle won really.