im so sorry for your situation.
im thinking that the only solution is prayer. pray for guidance, pray for strength. see if you can take a weekend without the kids - even if you just stay home, and try to reconnect. try to talk about the things that made you fall in love to begin with. ask him to trust you - to talk to you about things - not other people. i dont know if it will help to tell him this or not, but by him talking to anyone else about your marriage is a violation of your marriage. tell him that you want to work things out and ask him if he wants the same. figure out what he wants.
then pretty much find a counselor. there will have to be sessions where you are together, and sessions where you are apart. deal with the issues. divorce NEVER is an answer - it doesnt solve anything - you will just be forced to move on without resolving any issues that caused the distance to begin with. remember to do the little things you know? i have heard about marriages that were on VERY thin ice come back from the brink but just ONE of the 2 people in the marriage starting with the basics. the little kisses, the smiles, the massages, making dinner, doing the chores without asking for help, no nagging - even if he doesnt deserve it, even if you dont feel like it - try to do these things anyway. even if you dont feel like having sex with him, if he shows interest - DO IT! :D
one thing that you have to remember is that you sound like you are already in the position of competing for your own husband. this is your time to become the woman that you used to be - a woman who desires her husband. a woman willing to FIGHT for him. you dont have to say anything to the other women, that might furthur distance your husband from you - but certainly fight to keep your man. do the things that make you more attractive than the other women. be the one who sympathizes with him - be a wife who cares deeply for her husband.
i know of a few books that might help you. one is "created to be his help meet" another is "the power of a praying wife" and if your husband is willing there is also "the power of a praying husband"
these books might give you the guidance and information that you need. another one i can think of is "the proper care and feeding of husbands" which is easy to read and offers a no nonesense approach to relationships, and i think thats where i remember reading about you need to fight for your man - treat this as if you were dating your husband - and you have to compete for his attention and time. when things get "comfortable" it also means boring - and your husband has already had conversation with other women - they are probably infatuated with him and thinking "poooooor guuuuuy" and sympathizing and stuff... and that makes him feel good.
its within your rights to compete!!!