Does anyone believe in the whole "What Goes Around Comes Around" thing?

Has someone ever done you REALLY REALLY REALLY bad, they treated you horribly, and then went on as if they never did anything to you. Maybe for a second you thought “oh they are getting away with what they did to me, and its not fair.” Did they ever wind up coming back to you and regretting what they did? Or did they ever come and say to you “I’m sorry for what I did.” Or maybe you thought they were getting away with something and you find out that they are suffering badly and they needed your help? Do you think that its some truth to what goes around comes around, or have you ever witnessed that person that did you bad, come to find out that someone else was treating them the same way but worse? If you dont mind please share your testimonies, and stories of people that have done you REALLY bad and come to find out they were suffering or they had to wind up coming and asking you for forgiveness, or help. SERIOUS PEOPLE RESPOND PLEASE!!!!!