A.D.
I read your post yesterday and again today, and the responses that went with it, and I'm somewhat surprised that so many people feel "the same way". To me, that is very sad. I'm in my late 30's and very happily married (5yrs) w/ 3 young children. It is not always easy, and we don't always agree, but we respect one another and want to work out disagreements, so I guess I am very lucky. People in today's society are too quick to say, if it doesn't work, let it go...and I aplaud you for trying to come up with alternatives, such as "dating" , which is a great idea. If you can afford it, have a weekly date night or even monthly. In addition, once a week, put the kids to bed and eat a late dinner (just the two of you), then maybe play a board game, sit and talk w/ a glass of wine, or watch a movie and hold hands. Try to bring back the romance. Yo ucan also join the gym together, if he's willing. The YMCA is inexpensive and they have good facilities also. These are just some ideas.
Also, I think it IS all about you being a mom. And as a responsible, good mom it is your job to show your children (along w/ your husband) how to have good and healthy relationships. They need to see their parents respecting one another and loving eachother, to learn how to do that themselves. Children learn by example, as you know. It is not hea;thy for them to see you fighting and it puts one or both of you in a bad light. Children aren't cabable of understanding adult issues and it coudl cause them to pick sides when they see conflict.
Additionally, you could get the entire family involved in weekend (or after school) family activities such as frisbee in the park or some other simple activity. These things will bring you closer together as a family and couple.
I hope this has been somewhat useful to you. Good luck!