Narcissists are distinguished from other people by their stable patterns of thinking and behavior.
To avoid getting into an abusive relationship, you need to know the common traits of pathological narcissism.
Nutritional problems
Narcissists are prone to eating disorders, stealing food from other people's plates, and ridiculing people for being overweight.

One step ahead
Such people always go ahead of their interlocutor, as they need to prove their superiority.
They don't know how to give gifts
The egocentrism of narcissists leads them to give or re-gift cheap or randomly purchased things.
They can also give a gift that is hard to find a use for.
They don't answer questions directly
Narcissists like to ask questions that catch the other person off guard. This allows them to shirk responsibility.
Rewriting relationships
Narcissistic people explain events in a way that suits them, according to their needs, rather than the facts.
They have filled the past with omissions, lies and distortions.