Why? Because there are just so many thing in life that are out of your control.
You try your best to be as true and as patient you can be to you friend. Especially when you are patient, you compromise to avoid matters escalating from bad to worse. However, that could sometimes be misconstrued as a tacit admission of something, usually of wrongdoing.
One day, that patience reaches a limit. You want to let your friend know you feel, that your feelings have been hurt by your friend's overprotective and inconsiderate actions, as much as they may be well intentioned. But your friend has turned cold towards you, treating you as if you were a mere acquaintance.
Still, you want to salvage the friendship, as someone who cherish the bond of friends. So you walk up to your friend to ask for some time to talk. But you get those few cold words, "there is nothing to talk about, no need to talk" and you are left standing by yourself, wondering what on earth you did to deserve this type of treatment. All this time I had been true and patient.
It was really a 180 degree about turn from just a week ago.
And for what? For something that was not even a concern of my friend nor sometime that will affect my friend's quality of life. Perhaps my friend no longer wishes to be associated with me because I am thought to have made a stupid mistake. No matter. I cannot please everyone. Neither should I suffer fools gladly.
Therefore, I made the decision, and lost to lose a friend today.