L.A.
It breaks my heart to read your post. You deserve to be loved and happy.
You feel like you should sacrifice this part of your life for your children? What a heavy burden you are placing on them.. To make up for the love and family you do not have with your husband..
If they come to you in the future and tell you this exact thing you wrote, what will you advise them?
I was going to guess your husband has low tetosterone or is depressed, but if he is not willing to at least go to the doctor to find out, how can he expect you to stick around?
Instead I suggest you go to therapy. You need to work this all out and decide what is best for you. You are the mom, you set the tone for the home at this point.. Are you at your best? Are you modeling the type of marriage and home life you want for your children? These are the things you need to decide.
Life is way to short to be alone in a marriage. But this is just my own opinion.. And yes, I was the child of divorce and I knew EXACTLY what was going on in my parents marriage.. they could not hide it from me. It was amazing how much better it got for us, when our mother was happy and not just smiling on the outside..