Finally stopping by your place! Keep venting here, that is what it is for.
AlmostGone gave me some insight this weekend that I had forgotten about. I was going on and on about how H said he tried and I thought that was crap. But, maybe in his own way he did try. It wasn't my way, I didn't think it was the right way, but he was trying and I didn't recognize or awknowledge that.
Are there any signs you can see where is trying to handle OW, getting her out of his life or influence? Possibly it isn't what you want or need, but some small things being done?
If you have the conversation you are talking about, can you get him to come up with solutions? Tell him what the problem is and ask how we can solve it and let him talk first. See what he can come up with, and even if it is different from what you want, really think about the things for a bit before you dismiss them or give your ideas.