Many times in life, you will meet a person. You will interact with said person and form a type of bond with them. Depending on the bond, you'll act according in the way you perceive to be the best for that type of situation.
However, most often your perception of the situation will turn out to be wrong, or more accurately, you'll have a one-sided opinion regarding your interaction.
Two people can have two entirely different opinions on something and how it would work, despite not knowing that the other had a different opinion from theirs. Each one usually just assumes that the other person is either thinking the same thing or has guessed your own thoughts. Naturally, when the difference gets discovered at some point in the future, it can lead to extreme reactions.