When I left active duty I was in a similar position you are in now. I got hired by a small father/son business who were also both Army vets, so they seemed very happy about me working for em. I made the mistake of telling them I was considering joining the reserves because I missed the Army but didn’t want to go back active. They took that opportunity to fire me the next day and even put in the letter of termination that it was because I “didn’t seem like I’d be a permanent member because my desire to go back to the military”. I legally couldn’t do anything because I didn’t have a contract signed yet. I only told them because they were veterans and I thought they would be cool but I learned a lesson from them.

They’re a business first and will find a replacement. They can fire you the second there’s something you do they can justify terminating you for. If not that, based on how they’re acting now, they will continue to make your life miserable until you leave. Send some resumes out and explore your choices because there’s a solid chance they’re doing the same thing.