The longer you stay in one place, the greater your chances of disillusionment
Disillusionment can result when you are under an illusion and then you finally recognize the truth of the situation. If someone is using you then you may not realize this at first, so you are under the illusion that they are a true friend. Once you realize the truth then your disillusionment may cause you to doubt whether you have good judgment or not, and it is important to remember that everyone makes mistakes in judgment at times.