Landis and the Camouflage (Spoilers)
I decided to re-watch the film last night with my boyfriend. He had never seen it before. He pointed out a few things I had not considered.
I know a lot of the stuff happened off screen but this what my boyfriend pieced together.
My boyfriend thought Landis most likely wore his black paint makeup along with his black shirt and pants to camouflage himself in Julia's apartemt. The night Julia went back to her apartment Landis was there. At some point Landis turns out the light. Julia tripped over the bed and knocked over the lamp while walking in her aprtment armed with her gun. Landis was probaly standing in the dark saying "it's dark, no phone. I can't see. Jill where are you?". Julia shoots herself to get away from Landis. At some point Landis wrote the journal entry.
I played around with the idea maybe she went back to her apartment because she was sucidal but my boyfriend said Julia was way too self reliant. She wanted a life. Julia also didn't want to depend on Jill. Julia was independant and strong. She couldn't sit still in Jill's apartment. Jill even offer Julia that she could stay as long as she needed to. and shortly after Jill wanted to be back at her apartment. so maybe that is what happened the night of the shooting.