What The F*** Is Going On Here?

I was at my BF work in his office when all of a sudden his Ex-GF knocked came in and asked if she could see him for a minute. I quickly asked what is going on why do u need to see him. She didn't reply and my BF looked surprise and awkard I then asked him. He told me to please give him a minute to deal with the problem. I am very upset because me and this girl had exchange of words before. She knows that I I'm now see him and he loves me but she said she would do anything to get him back. She loves him and made a mistake and he belongs to her. He excorted her outside and they talked for a minute and she went to her car. I asked him what is going on? He said that she is trouble and that he don't know what her problem is. She said she still love and etc. I got very angry and left. I love my BF very munch and I know he loves me too. Its obvious that he isn't paying her any attention because she keeps stocking us. I'm tried off this girl she is wearing me down, I just want to knock her out