Your worst enemy , Love them through Christ pray for them.
No matter what they have done to you pray for them here.
This is not a asking but a commandment from Christ himself.
So do not allow hatred to boil within yourself, but forgive them.
I am not saying that they shall get off scott free on what they did.
But that its such as much for you that you forgive that person.
For Christ does not want you carrying anger for it is unhealthy.
It eats at you and can very well make you sick inside yourself.
This is why he says I will forgive you when you forgive others.