I only believe the first part.

I don't think what goes around comes around. That's just something people tell themselves to feel better. Some awful human beings die having never gotten "theirs", that's life.

But I do believe the first part. Forgive. You can't really move on if you don't find a way to forgive the person for what they did. You don't have to be cool with them or give them another chance or anything like that. But forgiveness means to let go of the anger and resentment that you hold toward somebody for something they have done.

They don't suffer for anger and resentment you hold, you suffer for it. So you have to do what you can to find forgiveness, for your own well being. To let that negativity go and move forward with your own life.