3 best-man turn worst friend : is it my perception ?

William Chang and Tom Chen - both my best friend in college ( Oxford ) and be my best man on my official wedding verification event - yes , only meilijg , me and them. And then things turn sour. The turning point :

1. William :At hot Rythem : my first artists management company and the shareholder who I invited without any due and I deem him betray me when have the shareholders dispute and then the story goes on...

2. Tom: when into him to CHT and win him a life secure career : disappointed in his chicken and not able to repay the gratitude.

 Am I too selfish or not aware of how things not going on end ? 

It's difficult .