But I think it’s not about taking things slow or fast, it’s her issues with trust that are the real problem here.  Relationship speed won’t make a difference when it comes to that. She never would’ve trusted you because she likely doesn’t trust anyone, and a relationship without trust won’t work. You could be the absolute best man on the planet for her and show her that in every way possible and it still won’t matter if she doesn’t fix those trust issues because they will likely end up sabotaging the relationship in the long run. And there also isn’t anything you can do or say that will logically convince her that there isn’t anything to worry about because those trust issues preceded your relationship. That’s something she has to work on herself and she’s the only one that can fix it.