How does Susan handle the guilt she feels over her affairs in the novel, Tony and Susan?

Susan doesn't handle her guilt; she reinvents her past. By forgetting the past and rewriting it, she is able to handle her guilt by projecting more blame on Edward than appropriate. Rather than taking responsibilty, she denies ever having wronged anyone in the past, so that she can play the part of the woman who is wronged in the present, as Arnold has had an affair.