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Quick update, as I feel rude not responding to the further answers...
The long and short of it is, he says he's not going. I asked if he *wanted* to go and he kind of went "well no, but I do think it would be good as they all bond that way and I it's not good for me to single myself out"... blah blah blah.
Anyway, I ended up getting a bit upset. I know that may sound daft to some people, but I just got myself into a bit of a state over it.
He said it didn't realise it would upset me so much (which is rubbish as we've had this argument in the past) and he would never want to do anything to hurt me, so wouldn't go. He then made a flippant comment of "if I lose my job then so be it, there's plenty of other jobs and we'll just have to muddle through"... so I obviously didn't get much sleep last night as I was awake worrying.
On the plus side to that, I did see three shooting stars :-)
Anyway, I don't really feel like talking about it much right now, but thanks to everyone who offered help and advice. x