They are just so caught up in the day to day living of their own lives that they never manage to call those that they really should?
My grandpa for example. He was 80 last year, not too frail but with health conditions. He lives in Spain, and I managed to meet with him ealier in the year. However he know phones me every couple of weeks and I never return the favour. I always mean to be always have reason to put it off. Its the same with friends and other family members too. Does anyone else ever feel that just when one aspect of their life is sorting itself out, there is always something else to worry about and feel bad about.