Should I give up on happiness and fulfillment ?

I have been married 14 years and have two children under 14. My problem is that I feel so selfish. I am considering leaving my husband because I am unhappy and feel unfulfilled. My husband is a good decent man and a good father but I have fallen out of love with him and dont desire him at all. We dont talk and have no relationship at all other than the odd quick to satisfy his needs. Am I being selfish in that I want a relationship where you talk to each other and laugh with each other? I dont want my kids growing up thinking that marriage is where you grunt or bicker with each other continually - would it be better for them to have parents who have seperated but who are happy? I am so confused ........I want to do the right thing by everyone but if I do that then I will still be unhappy as I am pleasing everyone else but not me.