A month or so ago I wrote something along the lines of, "Underneath it all, we choose the way we want to feel." And I wanted to expand on that thought. While we have no control over how someone or something may affect us, we do have the amazing ability to choose our ultimate reactions. Without consciously realizing it, we usually find it easiest to respond with anger/sadness to something that hurts us. We hold on to these feelings. They become a part of us. And though this kind of response is indeed tempting, there are other options: recognition and acceptance.
Feel your emotion--be it anger, frustration, bitterness, envy, regret, sadness...anything. Recognize it. And let it flow through you. Sit with it. Then, when you're ready, let it go. And feel the freedom.
Accept the entire situation as a necessary lesson...start to see what the experience taught you or perhaps understand that you may not realize the lessons till later. This option, when acted upon daily, allows for a kind of inner peace and joy that cannot be broken, no matter how intense our feelings may be.