Hi there...
It sounds to me like your a very lonely person. Ive been in that situation but without the children. Do you ever talk to your husband about the problem? I have been in the situation where my parner has become complacent and we ended up parting although i must admit there was lack of communication between us. I think everyone goes through these stages in life and most people if they try can get over it. I think it is worth trying to talk things out with your husband for the children becuase if you are unhappy it will eventually filter through to them no matter how you try to hide the problem.
Dont be afraid to try.....good luck