What about now?

Was married to my ex for 5 years, we had one child together.  Divorce has been final for many, many years, but we remained supportive of one another.  He remarried two years ago, which would have been fine, had he said something! He claimed he was only getting engaged....and shows up with a new wife and our child had to adjust in 24 hours' notice.  I knew he'd been talking with the woman and he claimed he told her our child came first in his life and would always be a part of his life (we pretty much shared custody 50/50 and always helped each other outta jams).

As it turns out, he married a seemingly imbalanced woman who is jealous of my child.  She's tried to spread nasty rumours about her (she's 14 now) and generally will throw hissy fits or 'feel ill' anytime it's supposed to be 'their' days for visitation.  We've dealt with this off and on for over two years now.  She's physically assaulted him at least once that I know of.  In any even, their marriage is their own.  How do I deal with it? My gut feeling is if I keep my child away, he will give in b/c it's easier for him to be passive, rather than tell his wife to bite it.  I'm also in a relationship of my own and my current b/f feels that I'm jealous of my ex.  Umm not really. Yes, it pisses me off that I had to pay my own expenses while we were married and she gets to sit at home all day (and still complains!).  I'm in a pretty good spot right so I'm not jealous of HER, but I do worry what all this will do to my child and her relationship with her dad.

Am I nuts? should I shut up? Should I bother sharing anything with the current b/f since he just thinks am jealous anyway?