First of all, understand discontentment. Discontent is caused by a constant multiplication of desires. One desire leads to another until there is never a moment when you feel fulfilled.
Desires are like traps. Because of endless desires, relationships have become very fragile. There is a lot of irritability and anger due to selfish attachments (to possessions and people) and pride (attachment to a particular image of the self). Where there is discontentment, the heart can never be still because wasteful, negative thoughts destroy peace.
Contentment is the result of spiritual awareness, which allows you to recognise negativity. It changes your pattern of thinking. As you tap your huge inner potential, all desires are fulfilled and you regain your peace.