Trust the man beside you, Noone else. If you cannot do that, then there is a problem.
In this case, the man beside of you would be your alliance. You must trust them completely if you are to reach the top. But by trusting another member of another alliance it led to failure.
We learn from our mistakes. Please learn from yours.
I do not choose sides, because that's the way me and my friends (AKA our alliances) like to play.
Find your playing style and enjoy it