There are so many things we regret in this life of ours. Some things are big, some are small. Some are meaningless to everyone but us; some affect those around us in a profound way.
I regret not saying I love you enough to my grandparents and not visiting with them enough before they died.
I regret not being at my Aunts funeral last year because I was out of the country. I really regret not seeing her before she passed.
I regret not keeping in better touch with friends and ultimately losing them. This is always an on-going regret since friends enter and exit our lives so frequently.