Is he okay?

My husband and I have been having a lot of relationship issues lately. He doesn’t communicate with me whatsoever and my once sweet, kind husband has been replaced by a cold, emotionless robot. He told me today he doesn’t really feel anything anymore. That when I say sweet things to him, he has nothing to say back but he still loves me. He’s in the military but has never seen combat. I don’t know what to do 😞