I also felt inclined to imply to this as a few weeks ago I ended a relationship with a man who I didn’t feel respected or loved by as a result of his behaviour, which in some ways is similar to what you describe of your girlfriend. I can say that although things aren’t all rosy now I certainly feel much more empowered in my life for making the decision to love and respect my own needs by choosing to leave. Similarly, I felt dead on the inside after months of staying with him as my self-esteem continued to plummet.
I tried to be loving, supportive, fun, exciting and all the rest while telling him calmly what bothered me. I knew that I couldn’t change his actions but hoped that he might. It just becomes exhausting after a while and giving up on that relationship has relieved me from so much daily anxiety and heartache.
I believe it’s important not to let insecurity get the better of us by creating problems that aren’t there, but I also feel like it’s important to value your own intuition as clearly there is a reason why you can’t trust her- perhaps that she keeps making you promises that she continues to break.
I know its agonising and as cliqued as it sounds nothing lasts, you will be happy and free again no matter how dark things feel at the moment. Sending you lots of strength and good vibes <3