I think it's too easy to see it from the perspective that he was due to move in but instead went on a two day bender and didn't communicate that he was going to be late. And on the surface that would be a deal-breaker for me.
However, look deeper and the reality here is that he's not just moving in, he's moving countries, giving up his business, his friends, his whole life and moving to be with you and back into a paid job rather than self employment. That's a huge step to take for anyone, and it's likely that, given his friends turned up unannounced he was suddenly left with the reality that this is it. Tomorrow he won't be in that country or with those people or doing that job, he'll be living in a whole different country and different culture, and all you've had to do was to wait for his arrival.
I think it's inevitable that at the last minute he would be struck by all that he's giving up to be with you. It's very easy to say that it should be romantic and exciting and he should be anticipating, and he likely was, but then his friends turned up and he realised that everything he is is changing on the stroke of midnight.
This doesn't necessarily mean that he's got cold feet, but he may well be apprehensive, and that is entirely understandable.
I've been there. My DP lives three hours away and has been procrastinating on looking for work and opportunities to be here. And with us that too reached a point recently where I said that it seemed obvious he wasn't keen to be here. He is, but he's also overwhelmed with the reality that in order to move here he will be giving up a job of twenty years and taking huge risks. I've recognised that because I've done the same in my marriage. And it doesn't mean the end, it just means that sometimes some people think more about what they want, and some people know what they want but going after it isn't always as easy, and sometimes you get a wake up call.
Talk to him face to face. Talk about how you both feel about this, and listen to what he's saying. He's made all the sacrifices, and now he's stalled and you no longer want to know.
Your hurt and upset is understandable, but given we're talking a move of countries here this really isn't as black and white as he went on a bender rather than excitedly ditching his country culture, friends and business to be with you.