Learning that everyone is not looking out for your best interest is a tough lesson. It is sad that you can't take people at their word or think that most people are honorable. The bottom line is that when faced with the choice of doing the easy thing or the right thing, I believe most choose the first.
I know I have but I hope that most of the time I choose the right thing.

It really hurts when someone you love and have tried to teach to take the high road faces the harsh realities of life. You want to protect them and make sure they don't get hurt. Unfortunately you can't always do so. Your only choice is to remain steady and keep repeating the lessons you have passed on all these years: do your best, take care of what you can and be able to look at yourself in the mirror and like what you see.