Hmm... Think that almost ANY relationship (not only love
relationship), after reaching natural mutual and harmonizing effect
for some time would have a tendency to build up a natural
'security' of its own kind... What I would call 'qin' in
Chinese...
Though it's always easier to maintain life more or less the way it
is (hence relationships).... It's nice once in a while to break
routines and truly utilise the moments people have between each
other for its meaningful purpose (not just an 'eco-balanced'
purpose).... This would have tendency to bring about a higher sense
of awareness for 'meanings within a relationship'... But of course,
you'll have to pay with more time and energy required...
Well... Your doubt and question would probably be answered just in
time...? At least once in a while, love would be either be
questioned or tested....