"Revenge is sweet!" But, in this case, Mick ... as Iain points out ... IF [God forbid!] anything happened to YOU, the LAST thing you'd want, is Jennifer claiming [even a small part] of what rightly belongs solely to your dependents.
So (at the risk of appearing in any way morbid) I would urge you to instigate divorce proceedings asap. I'm no lawyer, but it would seem to me that you have more than adequate grounds for doing so.
Take Care, Mick, and Good Luck, my friend.You deserve the best, and I just wish things had worked out differently for the pair of you!!