@Jessica2744 , it is so hard, but now you have to stop focusing on him and start focusing on yourself. Your going to make yourself crazy with worry, and that's not good hon.
Hey may come back, and he may not... nobody knows what is going to happen... he doesn't even know. This is all part of being in a PTSD relationship.
Isolation is so difficult for supporters to understand. First of all, it is impossible to tell if they are actually isolating, or if they just plain left you. Then it is hard to understand why, if they are overwhelmed and hurting, they don't want love and support. Also getting told I love you more than anything in the world one day, then having them disappear off the face of the Earth the next day.
You just cannot know what is going on.
The only thing you can do is respect his need for space and start taking care of yourself. What if he has left for good? You will never heal if you stay focused on him. If he comes back, then you will have to learn to deal with isolation periods, because it won't be the last time he does it.
Now is the time to focus on you, and your well being. Do things you enjoy. Spend time with friends and family. Take care of your health.