The fact your friend denies these things she's doing to you is questionable. A friend should have faith in what you're saying. The way it seems like they're their friend and not really yours.
It is painful when you're getting betrayed but you can move on with time, don't expose yourself to them for a while like a few months, then if you believe worth it, you can try to mend things with the friend who hasn't used you or move on cleanly altogether and spend your limited energy spoons on someone who's offering more reliability than these two.
Sometimes users act in crews, sometimes not but are good at manipulating the others and treating people differently at different times. If this user is using your friend as an interface to finding new victims I don't suppose they will actually show their ugly face to them as they are a different kind of resource.
If you're feeling groomed or pressured into things, being autistic it's good to be careful around such people but also, don't try to expose them as it's almost impossible and you can get in trouble for it, and because it's going to get you hooked on cat and mouse games which will further endanger you
Moving on is a great idea, but try to be open to affectionate people who are good to you, if you put up walls to quirky friendly people you might get to the colder ones who make you chase but don't retaliate.
I think that every interaction is part of learning the personality of a person, don't expect automatic success and with time some personalities are easier to spot from their interactions with others, their arguments with you and respect and care shown, the more overt and non brilliant ones get easier to predict.
Don't give up searching, don't waste your time with toxicity, health and energy is important, and eventually you'll get to the real friends that you see are not superficial connections that have positive wishes. Oh, and when in doubt, trust yourself, don't risk what is dangerous. That way you won't waste years and health and will be able to get to the quality people you deserve.
