I'm sorry. Hopefully he's just about burned through his nine lives at this point. I can't see the court looking kindly or sympathetically at his behavior. My ex tried to accuse me of interfering with his relationship with our son, but reality told a different story and that didn't stick (nor did any of his other ridiculous accusations). I think that will be the case here as well.
But coming so soon after a prolonged battle, your mind is already exhausted. I think that he is banking on that and trying to intimidate you. Stand your ground. We are here for you.