Am I being selfish or am I reacting normally

[ItsMum14]

Hi there. I just wanted some fellow women's opinions, as in real life I have no real family or friends to talk to.

My partner of 5 years has totally blindsided me. We've been incredibly close and inseparable for the entire 5 years. We've had our ups and downs, but never anything that has stopped the strong love that we have for eachother. This relationship was it for me finally, trust, same sense of humour, loyalty to eachother etc. I do believe he is "the one", and I believed that we were strong together and were one of those couples that would last until old age if we really wanted to.
Anyway, just yesterday, he totally blindsided me with some information. He got a job offer for the air force and he wants to take it. I had no idea that he was even applying for this role, no idea it was even a thing that he wanted to do. He said he didn't tell me as he didn't believe that he'd get the job anyway (but he's been preparing for it for the last two years with no mention to me).
Instead of congratulating him, I told him that if he takes the job, I really see no future for us anymore as it would mean I would rarely see him. He says that's selfish of me, but surely he's the selfish one for staying with me knowing that he would be leaving one day anyway.
I really feel broken as I stupidly revolved my entire life around him, and had I known that he would eventually make plans that would end us, I wouldn't have gotten so invested.
I have nobody else, and I have never loved somehow as much as I love him, and don't think I'll ever get over him, as he was the one I knew I wanted to be with until the end.
He said he's lost respect for me now because instead of me thinking outside the box, I've just given up on the relationship. Surely there would be no relationship anyway, as I would never see him and that isn't for me.
I guess one lesson that I've learnt is to never make a man your entire world.
Am I being unreasonable or is it him? How can he just do something so big without considering how it affects me and us? Or am I supposed to be happy for him despite what it means for us. He's mid 30s too, time we settled down together properly, not started randomly deploying ourselves overseas.
I'm broken from this. I guess I'm writing this here, because I have nobody to talk to in real life.

Thank you for all of the replies.
I see a lot saying that I sound intense. Not at all, we don't currently live together, and he recently had a career change which I supported, even when I knew I'd see him less. He has his own things to do and I have mine too. It's just this one, we're talking about going months at a time, maybe longer without seeing one another. I don't even understand how a relationship can continue in those circumstances.
I've just been talking to him again. There is no mention of me going with him, and I'd just have to basically see him as and when he came home.
I have stuck with him through quite a lot, and has has stuck with me. We are supportive of eachother. I guess it's just the whole part where he's been preparing for this behind my back, and now lumped this information on me like a huge dump.
Marriage, children have both been discussed, but if he does this, none of that will happen anyway, I'm no spring chicken.
I guess it's times like this when you finally realise that you were on a different page to the other person all along.
It's like a knife to the heart. I've been through heartbreak before, as we all have, but I really believed that he was the one for me until we were old (if indeed we make it to old age)

Feel really sorry for you considering all you say about the relationship. He doesn't sound to have invested in it the amount that you have, yet he hasn't made that clear to you.
As a sideline, yes I'd agree that it isn't wise to stake too much on a man. Afaic, women make far better friends, men make night-time lovers.