So today I had an argument with my -now ex- girlfriend. She started to be really aggressive and threatened me with throwing heavy objects at me for example my laptop. It then escalated and she started punching me. I felt that I had the right to defend myself but being me I first told her to get out of my house. When she refused and tried to attack me again, I punched her. Not hard but enough to keep me safe from her. Now she says she is going to report me to the police and all her girl friends are backing her up with that. What should I do?