As an alumni of a long term marriage, I cannot imagine not talking, conversing, arguing, or yelling about the reasons the marriage is not making one happy. I mean, I would think we WANT the marriage to work,......... it just, for whatever reason, is not working out like we had envisioned.
Maybe I am just too, "this is how it is and I don't like it and we need to figure out a way both of us can be happy with some changes, so let's see what we can work out here...." I would consider trying very hard to talk about and make it perfectly clear what is going wrong and trying to find ways to fix it, only fair and right.
I would not want to leave a marriage until I knew I did everything I could to make it work, and that would include letting my spouse know in no uncertain terms what needed to be done.