I regret that in my life

I regret not spending time with you
So many days that I could do
So many ways that I ever knew
Some more moments I could have live
Some more talks and more
I did not know what is going to come
Or else I would have known
Life is truly unpredictable now I know
Don't have many words to show
But I know that this will pass
This is certainly not the last
Sorry to hear about your loss!