Throughout eps 1-4 you had oportunities to either condition Clem for the apocolypse (dont be afraid to pull the trigger (Larry). Punish the guilty without mercy (ditch Lilly/tell clem we have to punish her, kill those hicks) ditch ben) Or share hope with Clem (spare people, keep ben etc.).
If you did the former mostly, she kills him, and vice versa for the latter.
OR the choices really didnt mean jack.