Just want some opinions please.

I have an online friend whom I have met in person. We have been friends for quite a while and chat daily via skype as we live on opposite sides of the world.
A week ago he asked me to come visit him. I looked into it and realised it was possible but not going to be easy. I told him this and he pretty much wouldn't take no for an answer. He wanted me to come over in his summer. So, I did everything in my power and made it happen...except that I can only go for 6 weeks, when he wanted me to go for 3 months.
So, yesterday I had sorted everything out that had to be done...everything except for book flights. I was so excited and told him when he came online that I could definitely come, but only for 6 weeks.
His reaction was that 6 weeks was bad news....and now he would have to see about a job. And he said, that job is best done in summer, so he will let me know what happens.
After his response, I was angry, upset and disappointed and I didn't hide it. I felt like he had asked me to come, then when it wasn't exactly what he wanted, he threw it in my face.
We chatted for a bit, then he kept asking me what he did wrong, it's not his fault and why am I being accusing...

Am I in the wrong for being angry/hurt that he has changed his mind?