As far as him being out of town working, that's not a huge flag for me. My husband is in the construction trade and is often away. With weather being unpredictable here, and him having deadlines, I would always encourage him to do what needed done.....
especially if we ran our own company.
As far as being alone on Mothers Day, I'm must just be the odd one. If he couldn't be there, it is NOT going to be the end of my world. We would probably just pick another weekend to celebrate it, when everyone would be home.