Just because she is a satanist does NOT mean she is to blame,i'm not a satanist,but i know there is a difference between the stuff you usually see in horror movies about satanism and real life satanism.
I know there is a difference. He started dreaming of a snake woman torturing him 3 months before we broke up. Then a few nights ago, he told me they stopped happening when the snake woman turned into the new girlfriend and he had sex with her in the dream. This has to be black magic.
Not neccesarily reaccuring dreams can be over and over for years and it is a sign of the dreamers thoughts, feelings, motives;etc So it could be a matter of his deep subconsious fear of her, snakes or both dont always jump straight to magic.
As Arrowind said, there's a decent chance that the dream doesn't mean anything at all. When I was little, I had a reoccuring dream that I was at an abandoned castle with my favorite video game hero. Did that mean anything? No.
first off Dragons, succubus are demons, not physical beings, so she is not one. secondly, do you have any proof she put a spell on him? third, just because she's a satanist doesn't make her evil. i have some really good friends who are satanist and they're the nicest people i've met.
if she did cast a spell, start by protecting yourself, if your ex thinks so too, you should cast a protection spell on him also [or give him a charm or something] then there's a number of spells you could try, but since i haven't heard his side, and this could all be a heartbroken girl wanting her ex back, i'll suggest an anti hex spell or some type of purification. if it is discovered some really strong curse is on him, then i'd suggest spells to break them up, but this other girl would have to be very powerful, and would probably have to repeat the spell she used regularly in order to keep someone who has no true feeling for her.
Am I the only one here that doesn't see snakes as evil? Snakes are knowledge, wisdom, and trickery (but not necessarily for ill intent). People fear knowledge, especially information they don't want to believe. Snakes are also fertility.
Having a dream of a female being of fertility that followed with sex doesn't seem odd to me. The fact that it was this new girl, seems like the insight (knowledge) side. My guess is, although its probably not what you want to hear, they're going to make "lots of de babies" together (Quoting Pink Panther 2)