Our mind is an interesting thing. When we are young our minds are in a completely different brainwave state than when we are adults.
So until about the age of 7 or 8 years old, we download all the things that are our experiences in life and this helps to shape our personality and understand all the stimuli of life that comes our way. If our minds didn’t work like this we would be like infants all of our lives, literally seeing things for the first time ALL the time and as you can imagine we would not be able to function as adults. This does not mean our minds are set in stone because of our previous programming.
But if you are not aware of this phenomenon you might repeat realities from the past or unhealthily blame your parents or your current partners in relationships for “triggering you,” to respond in whatever way you are conditioned to do.