Sometimes you need to look back to look forward to a better future. The truth about life is that you can't change what’s happened. Your focus needs to be on enjoying the present moment and doing the best you can to achieve what you want. Just think of a conversation that you had with someone that didn't go as well as you would have wanted it to go. How did it make you feel when you couldn't mend things with that person? It's time to heal and press forward.