Heartbroken and needing help!

[irishblessings]

I am really wondering how someone just flips a switch and any good from the past is now bad. Suddenly - in an instant - my world is really silent! He was my best friend - we did everything together - and enjoyed it! We had typical strife (work, money, kids) - but we seemed to be on the same page.
My parents divorced late in life - and to be honest - it is still a problem. I know I'm projecting but I don't know how I will live day to day knowing that he has created a new life for himself with someone else. I get up and go to work everyday and smile for my kids and friends - but by Saturday and Sunday the numbness takes over and I am at a loss! Is this "normal" for this new world?