Instead, they will most likely be overly critical or attempt to downplay your accomplishments.
"They will frequently cause you to feel badly about yourself.
For example, dopamine (a neurotransmitter that carries messages from one neuron to another and is associated with the brain’s reward system) is typically affected by addictive substances and may be involved in the development of depression, schizophrenia and other psychiatric disorders .
Family history, environment, exposure to stress and life experiences can contribute to the development of mental illness or addiction.
Also, both addiction and mental illness affect similar regions of the brain .
When a narcissist's emotional needs aren't met, their reaction is often grandiose. Talley, many narcissistic people may appear extremely angry or cry until the other person apologizes. "When the world is all about you, there is little room left to have genuine and sustained empathy toward others," says Talley.
"It seldom translates into action where they act in a way that requires sacrifice and humility." Don't expect a narcissistic boyfriend or girlfriend to be genuinely happy for you.
Your success threatens them, so you can expect that they will respond to your successes by ultimately diminishing their importance," says Talley.