When we are little we see the way our parents or elders act and that tells our brain that is the correct way to act. As we grow up the things they tell us we will become is what we think will happen and so we do that in fear that we will disappoint them.
The first couple red flags are him hitting you and trying to beat you/ kill you , no “man” should be putting his hands on a female.!
Answer: Endorphins
Explanation: Endorphins are chemicals secreted by the brain also known as neurotransmitters that send electrical signals inside the nervous systems.
The factors that initiate the secretion of endorphins are stress and pain.
When endorphins are secreted they reduce feelings of pains, and in runners that cause a phenomenon called " Runners high" which allows runners to keep running without feeling pain or stress.