One of the lessons I learned was that it is difficult to trust any person.
IF we start thinking that the bad people are those who are in the streets and the good ones are those that surround us and smile to the face every day, who are with us only when we are in good moments of life. Of that kind of people we should take care of ourselves, when there is a lot of money in the middle of people they forget even the years of friends, even if they are decades old, families forget their kinship.
I have seen many things that I can not comment, but I have learned, life taught me.
So to be careful with good friends, there are many wolves disguised as obese