Why do I feel like this?

My older brother Tom left home three years ago to live with his fiance in the philippines they're now married and have a 2 year old and an 11 month old. I had never met his wife although we talk daily through skype and such so I feel like I know them pretty well. Anyway I have a big family 6 older brothers and a sister. So like all of mt brothers left home except one. Now they are all gradually moving back to our hometown. Anyway. Tom and his family arrived here today and we were all really excited we went to greet them at the airport and it was amazing to see my nephews and sister in law for the first time ever. But in my mind I thought my brother would be more excited to see me but he wasn't at all it seemed. I mean he used to be the one who took care of me. Read me stories, played with me, cooked for me, asked my opinions for stuff. We were very close. But now Instead of being happy he is here I feel angry at him for not talking to me or hugging me. I feel angry at him for leaving me. I don't know why I feel this way. How come I'm not happy he is here? Btw He left when I was 12 I'm now 15. He's 24.