This is an important question precisely because many people hold onto at least a residual of anger when they recall deep injustices against them. Having some anger left over after you forgive is normal and not a sign of unforgiveness—-if—if the anger is not so intense that it is dominating your life. Is your anger controlling you or are you in control of your anger? If the latter, then take heart, you are probably on the road to forgiveness, especially if you have committed to “do no harm” back to the one who hurt you.
Some of the best wisdom I have heard regarding when a person has truly forgiven comes from the late-great Lewis Smedes in his book, Forgive and Forget. He says that if you wish the other well, then you have forgiven. As a point of clarification, you need not wish the person well as your boss now or as your boyfriend now if reconciliation is not possible. As you wish the other well as a person, you have entered into the spirit of forgiveness.
For additional information see: Learning to Forgive Others.