Girlfriend blackmailing to commit suicide if i don't marry her

Hi. I am stuck in a problem of blackmailing by a girl whom I loved and I promised to marry her. We even had physical with mutual consent. She never told me about his family background or work and always avoided. But I am suspicious and now she is forcing me to marry next month, pay her rent, leave my family. She threatens me if I didn't accept her wishes she will commit suicide or drag me to court. She had her cut her veins many times and even forced me to do the same. But I always sent her a fake image in return.