Have you tried asking them to stop bringing it up? I laid that boundary back in January with the very few people who know my sitch. They have respected it- they let me bring up things if I want, otherwise they leave it alone.
If you're talking about it, then stop!
And, quite frankly, with our sitch's it's a lot more brave to "hang in there" than it is to cut-and-run. Now, when there comes a time to move on, then fear can hold you back, but you aren't there. Tell them to zip it!!!!
Me: 39 H: 45 Second marriage for both H left 12/2013 M:4 T:5.5