If your person is not contacting you, then take it at face value and start focusing on yourself and healing. I think we have all been there at one time or another.
If you have wronged your person and are trying to apologize or rectify the situation and they are not contacting you – you are being selfish by continuing to force contact. Any desire for complete closure from the person you have wronged is a moot point. It is a foot in the door scenerio in many cases and used to continue contact. Your closure came when you wronged your person and they chose to leave.