The problem with people is that they are mostly wrapped up in their own life. Sure, everyone gives lip service to their "tribe" and "being there for you" but in truth, most don't want to be bothered in my experience. They are in pain? They need all the attention. You are in pain? Get over it. This is how we weed out the people we should not have in our lives.
That being said, there is also a subset of people who just don't know how to act or react. And a subset who think they need to be Switzerfriends.
Case in point for me, former in-laws. I tried to be polite and keep in touch and send cards and got nothing in return. My D says "They LIKE you" and she brings home lemons or pluots or whatever when she comes back from visiting there (they have fruit trees). Hmm. They like me so much they have. never, not once, called to see how I was doing, if I needed help, hi, howz it goin', nothing. That's a lotta like there....not. So if we ever end up at the same place, they put on the "Hugs" shows for other people, as if we'd seen each other outside of a random encounter in 9 years. Or even talked to each other in 6 years. For my kids sake, I roll my eyes and suck it up because I really think they have zero idea how to react to the situation.
As to Switzerfriends, I let most of those go. If they think what he did was OK with them, they don't have my moral code. Not really a good match for a friend these days. But hey, I JUDGE people. If Joe Fred down the street is a child molester, I JUDGE that I don't want my kids hanging with him. SUE ME. I judge everything and sometimes my judgment is "Eh, who cares?". This is freedom and everyone gets to choose what they want in their life. Do I WANT to hang with people who are stupid enough to believe lies that are blatantly obvious? Nope. I mean, my HX lied like a rug. I always say, he lied to me, he lied about me, he gaslighted me, he stole from me, cheated on me, verbally abused me and abandoned me. I didn't find evidence of the cheating until later, though he was sure we had been done for x months, x years, x decades, forever depending on the day. So it wasn't really cheating, right?
It would, however, have been great if HE'D TOLD ME. There I was schlepping along thinking he was just having a hard time at work, when it turned out he was the one causing his own problems.
And now, is it worth fighting the lies? Only it it matters to what you get in the separation/divorce settlement. People who really know you know where the lies are coming from. People who don't can believe anything they want. With any luck,you have lived your life so that no one will believe the lies about you. No one believed the lies about me, but they did Switzer.
List your facts as you know them, with dates and amounts if you know them. (he walked out on x date, on that date we have x amount in joint account abc. My half would be blah blah. House was worth x amount. Retirement worth x amount. ETC) Let your solicitor tell you what you best move is (use those numbers or current number or future numbers). Those are YOUR facts and it doesn't matter what he says. He can say the sky is chartreuse and you just say, my fact sheet says it's blue. Saying he's lying helps nothing in this case because it's obvious the sky is blue, if you see where I'm going. Whatever your facts are, and that can include some opinions if you have no way to document a date, you stick with those unless someone can prove something different. Boil it all down to a spreadsheet.
I can say definitively that this worked for me, and may not work for everyone. Your mileage may vary.