I remember one of the biggest obstacles to letting go for me was the fear of failure. I thought if I ended up divorced, I was a failure. Not true. It takes two to make a marriage work. One person cannot do it all. There is no failure in doing what's best for you.
I agree with the advice to be honest and open with the children. When I let my children know and see that I was having a hard time, that I was not perfect and didn't have all the answers, they became more willing to work with me and help in all situations. They were accustomed to coming to me for answers, and I was always there to provide them. When I admitted I didn't have all the solutions, they not only respected me more, but they rallied around me and pitched in to solve problems.
You don't have to be everything to everyone. You aren't letting anybody down by being human. Really.
:ghug3
L