A jackass
A person who feels no remorse and repeatedly hurts people is commonly referred to as a sociopath or a psychopath. These individuals often display a lack of empathy and disregard for the feelings of others.
It is vital that the person wronged, feels that the cheater has listened. The unfaithful partner needs to feel grief and remorse. See a marriage counselor.
A person with no remorse is often described as unrepentant or remorseless. Such individuals may lack empathy and show little to no guilt for their actions, regardless of the consequences. In psychological contexts, they might be associated with traits of antisocial personality disorder or psychopathy.
Repentance
An evil person is often referred to as a villain or a wrongdoer, someone who intentionally commits harmful or immoral actions towards others without remorse or regard for consequences.
sociopath
I felt true remorse after the incident that happened yesterday.
Remorse is a deep sense of regret or guilt over one's actions, usually because they have caused harm or distress to others. It involves acknowledging and feeling responsible for the consequences of one's behavior.
The person feels like an outsider of a group.
shame
Remorse is a noun.
He feels remorse, guilt because he knows that the monster he has created has caused the death of two members of his family.