Should I go? Advice please!!

[Livin4ME]

Hi guys. Ok. So H left again last week. Completely surprised by this. He had been home for a week. He told me 2 days ago, he's back with the OW. He has not told her that he was with me for 2 weeks while still with her. He says she'll walk if she finds out. She believes that while he was home, he stayed in the basement. He invited me to go away with him and his family for Thanksgiving to his family's cottage 2 hours away. He did tell her he invited me and that I wasn't going. This made her very upset. He is refusing to tell her I AM going because he knows she will walk.
As it turns out, she has a job opportunity in another state in December and will not go if she thinks there is a chance with him. And he will not tell her this stuff because he knows she will take it and leave.
I change my mind every day, if not every hour, as to whether or not to go for Thanksgiving. On one hand, I want to go because I know I will enjoy myself with his family. And I'm kinda hoping she WILL find out that I'm there. On the other hand, I don't want to go and let him have his cake and eat it too. KWIM?
She is already started to not trust him because he called me yesterday upset saying I called and talked her and told her we had been together sexually very recently. I haven't done that. But he received a text from her yesterday afternoon asking when the last time that we had had sex. He told her it was after the inital seperation, but didn't explain. I don't know what all has been said since then.
So I'm asking all of you out there! Should I go or no?! What's your advice!?