What I’m hearing is, he and his ongoing negative relationship with them is what’s causing their issues and jealousy. If he wasn’t with you, you would not have any problems.
I don’t know why you’re trying to defend him when he’s the one who caused all of this, that’s not a judgment it just seems to be the situation. That means attacking or hex-breaking only their side is never going to complete the work to resolve this. I would also not assume it’s over between any of these women, and any kind of positive feedback behind your back from him to them will make it more confused and worse.
If this were me, I would look at destroying that relationship link between them. I have my own homegrown poppet working to do this. I have never seen “cord cutting” actually work, but sour jars do I hear. You want these people AND your partner to not care about each other, not in anger or want, and then a major driver for the perpetuation of his should be resolved. Imo.
Last resort death curse them. It probably won’t kill them - that’s very hard to do - but leave the methods open and things can happen to remove them from your life “as if” they might as well be dead to you, and that’s good enough.