People use different excuses to justify there disobedience to walk in forgiveness
I can’t forgive him.
If that is your excuse, then listen to this: indeed you can’t forgive, but God can do that through you.
If I forgive him, he will abuse me or think that I am in support of his his sin.
Well, forgiveness from your side is not depended on whether the person is worthy of it or not, neither does it depend on the repentance of your offender nor his changed heart. The only reason why we forgive is because we have been forgiven by God’s grace.