
I'm feeling rather uncomfortable though, and part of it is the whole situation at his work before this trip. He was reviewed by his boss who sang praise to him but basically told him the only way he can get promotion is if he moves to their US office. They've been offering him a position there for ages, but he's told them no and always stuck to it. The main reason he says, is because of me, or rather - us. He wants to focus on closing the distance. I asked him, if he were single would he consider going there? He said he would.

Whenever they talked about this position, they talked about the temporary, 6 months period, which I told him would be something I'd be willing to go along with. But it became clear if he was to go for it, it would be a permanent fixture.
So right now he's over there with his US colleagues who keep bringing up this idea of him moving there. They're dangling this appealing offer in his face, while putting the glass ceiling above him where he is right now. They're not looking to hire anyone else in this position either, it's basically waiting for him whenever he changes his mind. They're all purposely steering him in that direction, even if he's already said no. I feel uncomfortable at him being constantly exposed to people who seem to have no regards for our relationship, it's like they're actively working on splitting us up. As if our personal lives mean nothing. Maybe it's because we're still long distance - I'm sure if we were married or at least living together, they wouldn't be quite so forward.
To his credit, he's always been consistent in saying 'no', even when I was open to it (that was while we still thought it was a temporary position). I'm happy and proud that he has his priorities sorted like that and doesn't look back. Yet every time he goes there for business, he likes it more. He enjoys working there and really likes his US colleagues. They also make sure he has fun, they take him out and make him feel important. I know this sounds awful but it would make me a hundred times better if he hated it and had a miserable time there. I know this is because I'm majorly insecure. But one of the reasons for that is our long distance status is clearly not good enough reason for people to just back the hell off. And this is just one more reason why we need to make plans to upgrade the relationship, as soon as possible.
Maybe you can work on a project for him or something while you don't have as much communication as you'd like? Whenever I know my SO and I aren't going to be able to talk to each other as easily, I'll write him a letter or make him something to ease the pangs of distance.
You're half way there! You got this.