Welcome to the forum.
A lot of us here love vets too. Unfortunately emotional numbing can be a symptom of PTSD... as well as feeling unworthy of love. Distancing and isolation can be coping mechanisms. Et cetera, et cetera, lather rinse repeat. So in other words, welcome to the roller coaster.
Learning about PTSD will help a lot. Joining this forum is a good start. It's a big help, and we have a great supporter section, and some very helpful sufferers who are always willing to give us some much needed insight.
Researching is helpful too. Here are a few great threads to help you start to get a basic understanding of PTSD.
https://www.myptsd.com/threads/the-ptsd-cup-explanation.13737/
https://www.myptsd.com/threads/stressor-vs-trigger-what-is-a-trigger.9903/
Also, I can recommend a few helpful books to get you started...
The Post Traumatic Stress Disorder Relationship: How to Support Your Partner and Keep Your Relationship Healthy by Diane England is what we call "The Bible" around here. It is a great first book for understanding PTSD as a supporter. It also has great sections on communication and conflict resolution. To go with it, I also recommend
Shock Waves: A Practical Guide to Living with a Loved One's PTSD by Cynthia Orange. That book is more about supporter self care.
It is possible to have a healthy PTSD relationship. It just takes some work, patience, and understanding on both partners' parts.