Sometimes... It seems to be something the older generation are better at than us 'youngsters'. They will often stand by the person they have chosen to live their lives with. I think they just take marriage vows more seriously than the rest of us. I've seen a couple of families which have broken up over mental or physical illness - yet our care teams are supposed to be better (more holistically) trained. I've seen plenty of people break up when a partner starts suffering from depression...