It is held that Buddha said “Holding on to anger is like grasping a hot coal with the intent of throwing it at someone else; you are the one who gets burned.”
It is very easy to feel angry about your situation as you go through the emotional roller-coaster that is divorce. “Why did my ex leave?” or if you were the one who left “Why did they behave in such a way that I had to leave?”
You can find simple answers to any question such as this, but the simple answers will not remove your anger. Asking “But why?” is a self defeating loop that will not help.
Calm acceptance of your situation is the only way to squash the anger you may be feeling. Work on that, knowing that it is what it is and anger will not improve it. The only route to happiness is by learning from previous experiences and accepting your current position, whilst working out how to improve it.
Let go of that hot coal and allow the cool breeze to remove the heat from your anger.