Worth it???

I could not remember when we meet each other and become a close friend.
We spent our precious time to be together and share our happiness, sadness and many more. Unfortunately, we argue just because of a small matter few days ago.
He date me on sunday (28/06) to sunway lagoon because he is going to further his study soon in indonesia then US. I promise someone to help up on sunday too so i refuse to go with him. Then, he is not happy the way that i always treat him.
Why??? How can he likes that?? I never break my promise just why fate always play on me in friendship?
He then argue with me that i always find reasons or busy to reject him.Goodness~~ I promise whose first sure i have to attend where what.=.= Speechless.
Today, we chat in MSN again just like usual but he says that he never meet a friend that bad before just like me.OMG!!! unbelievable~ sad!!!
He is going to fly on 22/08. I know he is going to leave me soon but what can i do? He hates me now. We no longer a best friend.
Izzit our friendship just end like that? Worth it???
Sign~~ No matter what happen next, you always be in my heart, friend.
Anyway, i just hope that he(JSWY) can success in his academic and a healthy lifestyle.