Honestly, it would be much better to look unstable than wimpy/needy/balless to your W. You annoy me to no end with your neediness and inability to solve very simple problems so I imagine your W is still rather fed up.
I wish I could press a button and help you get to the point where you just don't care.
I hope I am around the day you say to your W.... W, I am tired of your BS, I am tired of you sleeping with other men, I am tired of you using me when it benefits you and most of all I am tired of being married to you. I have decided to file for divorce, I have sought legal counsel and you can expect to be served on xx day. We will sit down and tell the children together although I will not settle for anything less than the total and complete truth from you. While my hope was to stand for our marriage I have decided you simply are not worth the time or effort anymore. All the best, K.