14If you forgive others for the wrongs they do to you, your Father in heaven will forgive you. 15But if you don’t forgive others, your Father will not forgive your sins.
Matthew 6:14-15
Without forgiveness given to others we may not expect God to forgive us. God requires that we forgive everyone who do us wrong. In doing this we have to remember that true forgiveness is always birthed out of repentance shown by the person who did the wrong. Without that it is really impossible to forgive anyone without opening ourselves to further abuse. The person who has been wronged have to find a way whereby the other person will be confronted about his behaviour. This leads to repentance and forgiveness. But if it is not possible in some circumstances then forgiveness without repentance may be necessary. But the best way is forgiveness with repentance.