I would look at the individual's responsibility to THE SELF, FAMILY, and GOVERNMENT.  How does Corolanus meet his responsibilities within his family (mother vs. wife and children), his own true desires, and his responsibility to the State?  His alliances shift.  As they shift,  where does he betray those alliances?  Ultimately, which alliance/responsibility does he ultimately choose to serve?  Which does he abandon? Are his choices mutually exclusive, or, in the end, does he serve them all?