How do you let go of a family member who has left your life because of work?

My brother has moved to the Amazon rainforest to live alone with the animals, he says he does not plan on coming back for a long time, if ever. And since he's living alone in the Amazon, he can't call or text or send letters, I don't think I'll ever see him again. We were very close and he has an obsession with animals and has wanted and planned to do this for most of his teenage life(he's 19 and I'm 14) so I don't doubt that he truly wanted to do this. The trouble I am having is that I am kind of sad and angry at the same time, I miss him and I want him back and I'm angry that he's left me, but I know that he is happier in the Amazon. I don't know what to do, how should I feel?