No, I am not. My marriage is an important legal reality that allows me to take proper care of the woman with whom I had an 18-year relationship. We live in separate houses in separate cities and have lived separate lives since 2008. My financial situation is idiosyncratic, and staying married is "doing the right thing," so I do it.
Obviously, this causes some problems, like the need for an elaborate explanation at the top of my dating profile. It means that a woman who considers getting involved with me must evaluate me to see if I am emotionally available (I am), and if I am capable of sustaining a new relationship and perhaps a new household even as I continue to fulfill my existing obligations (I am). If you think it's worth it, you can judge for yourself.
Now, on to the conventional part of the profile...
I believe a long-term relationship has three elements:
1) we enjoy spending time together, day to day,
2) we are compatible in sex,
3) we want to build a joint life together.
"Dating" is the process of working from the first element toward the last. Since becoming "single" six years ago, I have been in relationships where I got to #2, but I haven't yet reached #3.
So, I'm looking for a woman with whom I can investigate #1!