:rocker:
You are good!
Reeva was 30, OP 26. Reeva had just gotten out of an abusive relationship, and at 30 she was blossoming and independent, not in any need of or in a rush for a new long-term relationship. OP had lost his long term relationship where he could dominate a pretty blonde, make her submissive or subservient to his mega-life and desires, and he wanted to fill that hole in his life. He was rushing for a new relationship like the one he had with Samantha Taylor. Anyway...
Please permit me to change a couple of things from your post for my thought process:
Maybe they had had a lover's tiff or - maybe he proposed and she refused and he went to bed angry, she upset.
He could have been brooding ever since and suffering from narcissistic injury and he starts the arguing all over again at 1:00 AM. It reaches a peak at 3:20 AM and he thinks, "If I can't have her, nobody will" and he kills her in a rage. He starts to plan the intruder story to cover up his actions.