When we Love ourselves we Refuse to Allow Others to Manage our Feelings From Afar - Unknown
It might be hard to really put this advice to work since our relationships often take control of us emotionally but you must realize You are the only one who can control your mind. Nobody else can do that for you, therefore it is your personal responsibility to keep your emotions under control. Don't give that power to Anyone else.
A good way to prevent this is : "Instead of being angry at the way we were treated, regardless of how horrible we have assessed it to be, we need to learn to view that treatment from another perspective. They did what they knew how to do, given the conditions of their lives. The rest of the stuff we carry around with us is ours. We own it all."
It's easier to take this road because by resisting bad feelings toward those who have hurt or disappointed us we are only hurting ourselves.
This sums it all up: "When we forgive another for anything that he or she may have done to us, we are really saying 'I no longer give you the power to control who I am, how I think, and how I will behave in the future."
It all comes down to personal power and knowing that it is all in your hands. This is in no way to excuse the bad behavior of those who have hurt us but it is a way to understand that by holding grudges we are ultimately only hurting ourselves.