Ow ... the past! It seems to me like you are a very nostalgic person @joseacabrerav
You see, that cycle you mention : good - bad - good - bad ... I propose something to you! Why don't you do some sort of test to learn a little bit more about yourself? For example, allocate the time of a month. Give yourself a goal you want to reach at the end of that month: Want to finish reading a book? Write 1 poem per day? Go for a walk three times a week?
On top of that, every time you feel tempted to revisit the past, make long term future goals. Decide where you want to be in life in 5, ten years time. There is a good exercise in psychology that goes like this. Imagine yourself in 10 years time, then, write a letter for the self you are today.
At the end of the month you will see how the cycle of good - bad - good -bad has diminished. Do you accept the challenge? :D
i do this challengue always abigail