Don't judge anyone. God is a perfect judge and He will judge us all righteously and perfectly, then He will give us His mercy. You don't have all of the facts about what happened and you don't know everyone's motivations or what made them act like they did. You are also a sinner just like them so you have no right to judge them for their actions. Always think the best of people until you are proven otherwise and even then know that their are good parts of them as well. Forgive them if they sinned against because we all sin and if we don't forgive others for their sin that makes us very hypocritical. Don't forget healthy boundaries, don't let someone who seriously hurt you back into a position where they can hurt you again. However you do need to forgive them, I can't tell you how much to let someone in your life after they hurt you because it's different in each situation but forgiveness is never optional. Jesus forgave the ones who sentenced him to torture and death we can forgive the people who hurt us in our lives.