Why does one have to do anything ? Sometimes there are some great reasons to care and some great reasons not to care.
One of my best friends moved to Melbourne about 6 years ago but we've always had a good relationship (since 1990). Found it a bit strange to discover his wife had left him 3 or 4 years ago and he'd been carrying on as if nothing had happened. Bit strange. Not sure why he would keep this one quiet - the field we're in, music, is pretty small and 2/3rds of entertainment marriages split. Not exactly rocket science. So, to sum up, my family still cares for the friend but there are also reasons not to care. It's a paradox.
If all else fails misdirect yourself ! Find something else to think about. Dance the tango. Feed the ducks. Go and eat 10 donuts. Anything. You only have time not to care if you have time not to care. Getting fluid with life is more rewarding.
PS It's nearly 2am, I have to go now and wake up Geoff ! He's on at 2am. Lol.