If I loved you less Part 1

Remus Lupin is a good man to whom many bad things have happened. He has learnt that getting too close to people leads to pain and so he's become the master at walking away, of never letting anyone get past the fortresses that guard his heart. What happens when one woman breaks down all his defences? Will he learn to love or will he walk away? A T/R short. Complete. Some Swearing.