Trust erodes with time

When we are young, we naturally trust everyone. As we grow, I've come to realize that there are only a handful of people in life we can trust. Trustworthy people are really rare to come by.

Even your best friends can be out there to get you. No one is going to think for your benefit - they are only thinking of their own benefit. Always make a decision about what's good for yourself and don't be swayed by what others say if you feel there they are acting even a little selfishly and overlooking your progress.