How does happiness turn into loneliness? The beautiful glow of her smile is lost, bound in steel wire and tortured in the same cold darkness that now hides her heart.
How does passion become apathy? Once a kiss that stole from the lungs and left the lips wet and wanting more; now a kiss from a mouth dry and lips chapped, breathing toxin - a kiss of death.
How does commitment fall silent? The foundation always holds strong through the trials of weather and time, but housing fear and pain has collapsed the walls that surrounded us.
I don't think there is much of any optimism to be found in the third stanza. It notes that the foundation has never crumbled before, but the walls have entirely collapsed. Sometimes there isn't much point in bothering with the foundation of a house if there are literally no walls.
it doesn't quite fit with the other two. but, with that being said, it's actually my favourite stanza of the three. perhaps it just needs a different context.
very sad, though.