When you see a bully or someone who has mood swings and easily gets provoked and becomes violent, the person is likely a Psychopath.
Beware of such people.
In developed countries, psychotherapists can help such people. But in Nigeria, psychotherapy is rare. And many ignorant people have become victims of psychopaths in relationships.

Beware of such people for your own safety and welfare.
Be polite in avoiding them and don't get ensnared and trapped in any relationship with them.
Avoid being alone with them.

hm, you should know.