There are all sorts of reasons why it might be impossible or impractical for a couple NOT to live together in the same house - what if they have children together? What if they’re too poor for them to be able to live apart? As nice as it is to live a life that never causes scandal to the neighbours, sometimes there are more important factors to consider
Should they be denied absolution and communion, even if they’re genuinely sorry and making every effort to have the relationship become a sacramental church-sanctioned union?
Even for the girl who fell pregnant - we all sin, we all confess, we all relapse into sin at times. That’s why we’re all required to confess every year. Welcome to the wonderful world of being human.