Now imagine it from my situation:
You've been together for 18 months, are living together, the relationship is heading in the direction of marriage.
It's one of those 'If I don't go now, before we settle down, I'll never go' kind of things. He promises me it won't affect our relationship in the long run- my blessing is the only thing standing in his way.
In a perfect world I'd go too, but realistically I can't afford to take any time out from school. I have another 3 years to go and couldn't be guaranteed a placement at the Hospital I'm hoping for. I don't have the burning desire he does; I travelled before embarking on my degree. Alas, he did not.
He wants to climb mountains and trek through jungles. He can go off with the best intentions in the world, but who knows how he'll change.
Am I in any position to stand in his way?