I agree with the other posters, you have to establish boundaries with your family in regards to talking about your wife around you. What they do behind your back is their business. If your sister tells them what you tell her, then you may have to back off telling her things, too. I never told anyone in my family or my H's, and now things are okay, I am really glad no one knew.
Personally, I think it would be good for you and potentially your M if you were able to get another job, and eventually get another place to live, because even though you seem to have a close family, they are too much in your stuff.
And no, as long as you are married, you don't date anyone. It will not make your W get jealous, and come running back to you. It just isn't a good idea to toy with that.
And I don't think your situation sounds hopeless. Good luck.
