Omg maybe you killed your ex gf and then killed Julia. You got drunk, and were supposed to pick up your ex who needed a ride from a club that she was at. You guys had a fight over the phone and she said fuck it and she walked home anyways. You felt bad about it and weren't thinking properly so you went to pick her up. The alcohol in your body started to take effect. You were trying to stay focused , but your judgement was off and then you heard a loud thud. Your car slammed directly into your ex and you woke up out of your drunken stupor. Realizing what you had done you broke down in tears and initially thought about turning yourself in when you heard the sounds of a car in the background. Knowing you will at the very minimum spend the next 20 years behind bars, you panicked and fled the scene.
You felt so guilty about that you couldn't feel emotionally attached to another female. The night of Julia's murder, you were at a party. Your friend gave you some PCP to try because you were feeling extra down that day and they wanted to liven you up. You took it in a pill form so the effects weren't immediate. Julia was talking to you because you had second thoughts about it and she seemed like a nice girl who was there to help calm you down.
Fast forward an hour later and the drugs kicked in to full effect. You had just had sex with this beautiful girl and the guilt triggered by it caused you to have flashbacks to the night of your ex's murder. You couldn't handle seeing the constant vivid pictures of your ex's lifeless body and you panicked yet again and out of overwhelming emotion choked Julia to death.

Pretty sick bro!