In Joker (2019), just after Arthur came to know about his childhood reality where he was abused and brain traumatised which led to his present day condition. That's also the reason he has such an unusual laughter whenever he faced any emotional pressure.
He directly went into his "girlfriend's" room which we were shown that was in his imagination only. The time that he spent with her was a creation of his own mind. But I am really confused whether he killed her because this picture just freaked me out:
I mean, the look on his face is terribly disturbing. But the movie didn't tell whether he actually killed her or not. I am pretty confused at this point of time. What does that shooting himself signal actually meant? It was also shown earlier when that same woman was struck in the lift and calling the apartment awful. He made the same gesture to her but it was more kind of an amusing one, which was not meant to harm anyone. But here, the story is different. He is terribly disturbed and can do any harm to anyone. So does he really kill her?
We also saw that after that there was a scene where he killed his own mother. I know that this is another question but both of these scenes were back-to-back and connected. Therefore it is important for me to understand both of these incidents. I know that he is going through transformation and a lot of havoc has befalled upon him, but he was the guy I thought would always love his mother. He was the kind of character who cared for her. And the last thing I expected was him killing her. I felt really shocked and amazed as it was really beyond my expectation.