I think this has brought to a head just how pissed off you are because he goes away a lot. And he goes away on a weekend day as opposed to during the week. And according to one of your posts, you're assuming it's because he doesn't want to be with you.
I've done the expat thing with dh, who also travelled a lot when we lived abroad. And he would leave or arrive at the weekend. It's totally normal to leave at the weekend. I agree it was a very early flight on Sunday but you don't know if this was the only available flight for the day.
His communication was pretty shit. But it sounds as if he knew you were going to hit the roof when he told you he was going away at the weekend so he hid the fact he was going early to avoid another argument about it.
Yes, it was pretty crap. However, I think you need to have a very good look at your behaviour as well as I think you are both jointly responsible for this situation. My dh hated all the flying off. It's not fun. The inside of a hotel and the inside of another meeting room is exactly the same regardless of whatever exotic country he happens to be visiting.
I expect your dh doesn't want to apologise because travelling around is tough for him, not just you. Are you recognising this when you're getting angry and upset with him? And if you're working and happy in your work, it may even be tougher for him. I get you're pretty miserable with the set up. It sounds like you are making his life pretty miserable as well. And he doesn't get to go on the fab weekends away as recompense for all the shitty travelling he's doing. Perhaps he's jealous of all the freedom you have.
I think you both need to sit down and talk and have an adult conversation about your situation. Neither of you sound very happy. Perhaps it's time to re evaluate life. You could both move back to the uk (for example) or whatever will make you happy.
When dh and I were abroad, one of the marriages broke down because the mans wife hated that he was no longer doing a 9-5 and according to him would scream at him when he arrived through the door. She went back home with their kids. If you don't sort this out, your marriage could be going the same way.
And please wash the kit. I get the anger but that isn't going to help your marriage. Have a good rant on here and get it out of your system. The last thing your dh needs to do is to come home to an angry or PA wife.