Hi, I'd like to help you with your question.
From your description, it sounds like your partner is abusive and probably has a personality disorder.
Characteristics of an abusive relationship include feeling confused, dominated, minimized (by her yelling at you), and feeling low self worth. There is also a sense that you are not sure what is real and what isn't.
The goal of an abusive person is to make you feel less about yourself so they can take over the relationship and control you. They will use many different means to do this including yelling, anger, belittling and trying to control your actions.
Your partner's inability to tell the truth also is evidence of a personality disorder. She is manipulating by lying.
You have two options. You can stay in the relationship and accept her behavior. This would not be ideal since it would require you to stop being the person you are and adjust your life to fit hers. You would also have to accept being abused, which is never good in any circumstances. Since people with personality disorders need insight in order to get help and get better, the chances your partner would change are minimal.
You can also leave the relationship. Since you have tried it and your partner became upset and threatening, you may need to plan ahead before you go. Get support from family and friends, be prepared to cut all ties (change phone numbers, etc), and set up an appointment for yourself with a therapist. You may want to consider getting therapy to help you cope with what you have been through and the ending of your relationship.
Here are some resources to help you:
I hope this has helped you,Kate