You would be wasting your breath. Just wait....Karma will arrive one day for him.
Fwiw, my first H was a member of the same cunt club. He tried it on with my Mum, my sister, every single one of my female friends, lots of work colleagues....I always had a gut feeling something was off, but no-one told me the truth and I never caught him in the act....until one evening, a male friend was so pissed off that my H had tried to snog his wife, that he told me about everything (they were friends, so he knew most of it). It was such a shock, but then lots of things fell in to place (iyswim).
I don't know how many of my friends actually slept with him. I suspect one of my best friends did, as she was going through a divorce at the time, and when I think back she was always flashing her cleavage at him (uurgh). I know for certain, that my very best friend did, as I checked his phone and there it was, in black and white. I left him then. And ditched her (obviously).
For a few years he led the single life, out at bars every weekend, scanning for women. 2 years after I left, he got serious with a woman. I can remember thinking "if he can cheat on his wife and the mother of his children (me), then I'm sure he isn't going to be faithful to her".....fast forward a few years, after she had moved in, and of course history repeated itself and he cheated on her. I suspect with her sister, for various reasons. So she left him.
Cut to now (9 years after I left) and he has a new GF of a year. She has a young DD. She's desperate to move the relationship to the next level. I feel so sorry for her, as I know just how her little story is going to end and she's so invested....
He's 50 later this year. At what point does this type of guy stop shagging about? Probably never.
Fwiw, I have a lovely DH now. Devoted, faithful, a real good guy. They do exist! Oh and the irony....he is ten times fitter and better looking than first H. We've been together for 8 years. He's lovely.
Don't lose faith, there are lovely men out there. You were just unlucky, like me, the first time around.
You will find a lovely guy, and this will all fade away....whereas he will probably die alone....