When you know that you have done something wrong/hurt someone, you have apologized, but the other person is not willing to forgive, how to deal with that feeling of guilt?
If you have already realized your mistake and apologized, you are not guilty. It is within the other person’s prerogative to forgive. If he/she is unable to do it, it is their problem, not yours. Blaming yourself will not help. Give it some time, may be the person needs more time to forgive and forget the hurt.