Really needing advice.

Ive been with my boyfriend for a year and 4 months. In this year and 4 months A LOT has happened. My boyfriend had broken up with his ex in February of 2016, and he and I got together in May of 2016, well after they broke up she said she was pregnant, and was being a complete physco towards me. I was receiving messages on Facebook from this girl, multiple texts from her, her friends were texting me and messaging me on Facebook, my boyfriend's ex was even messaging MY ex, she was messaging my boyfriend multiple times a day, she vandalized his truck 4 different times, I was pregnant at one time and she even wished death upon our child and sadly my pregnancy did end in miscarriage. She was just being your typical crazy ass ex. He and I decided to just delete social media and he changed his number. After he changed his number, it quickly got to her again and it started all over again but she was saying the child she was pregnant with wasnt his, then it was, then she wasnt sure, and she said she wants my boyfriend signing his rights over, etc. My boyfriend then contacts the law on her for the 4th time trying to pursue charges, but they said since she wasnt constantly calling or textiny for 24 hours that it wasn't harassment. Well, everything continues but the child is born in October and in May my boyfriend ends up getting a letter for DNA testing. He and I both were crossing our fingers that the child wasn't his. Well, a week goes by and the DNA test says the child is his, but he has never been involved due to the crazy mother and he honestly thought the child was not his. So, he now has to go to court on 8/23/ because she wants him to pay child support and he wants me going with him but I have a lot of hate for this girl and I just don't know if I could even sit in the same room as her after everything she has said and done. I want absolutely nothing to do with her, and my boyfriend wants to sign all rights over, like she previously said she wanted him to do. I do not want to deal with this girl, and she still to this day continues to make efforts to get ahold of me in some way, and she has even came to my place of employment when I was not there. I dont know what to do. I want to be there for him, but I dont want to stress over her.