I agree with catperson that 2012 is too long.
I'll add a third on that, as well. I don't know what I would have done if I'd been ready to separate and had to stay together for a year and a half or more longer. I'm pretty sure one of us would have been arrested and the other hospitalized.
Oh, and I did change the locks, but not until six months after separating.
I have tried the emotional honesty route. Either I'm terrible at listening and communicating, or the target audience is refusing to listen.
Been there, done that, have the very worn t-shirt. We do not have the power to change other people, only ourselves. This means that we must eventually accept that we've made our requests and case, but the answer is "no". Sometimes the answer is "no", and we have to deal with that reality. We have no power to make other people take us seriously, or care about what we say.