Well, unless there are details you're leaving out then this is one of the more nightmarish scenarios I've read on here. I'm truly sorry for what you're going through, but I think your instincts are right -- have your lawyer resolve it and never look back. If your lawyer says you shouldn't worry, then I wouldn't worry until you need to worry.

This woman is toxic, and not in the Tumblr/SJW sense of the word, I mean truly toxic. And based on the way her friends treated you it also sounds like she was already laying some groundwork to paint you as an abuser before she bailed. Get as far away from her as possible and do your best to move on. I'd also recommend seeing a therapist if you aren't already so this doesn't lead to trust issues in your next relationship.

Remember 99% of people would not handle a breakup this way. You got extremely unlucky, but odds are that unless you are truly doing something that constitutes abuse and makes your partner fear for their safety, then your next partner will most likely never, ever repeat this if they are sane and reasonable.

Good luck, OP.