So what would be the motive then for getting up in the middle of the night, waiting for your girlfriend to go to the toilet and then shooting her through the door and then claiming you thought it was an intruder?
That's the thing - I don't necessarily give any of his story any credence at all. Nobody knows they had even been asleep - we've only got OP's word for it.
For all we know, they could have been awake and arguing. She may have threatened to leave, he loses his temper, starts threatening her, she runs into the loo in fear, locks herself in and he shoots her through the door in a violent rage.
Then he makes up story of intruder that fits with the physical evidence in the room to cover his tracks. He wouldn't be the first man to murder his partner in a fit of rage and then be all tears afterwards.
We'll never know the truth for sure, because we can never hear Reeva's side of the story. But a woman is dead, and I don't buy his story at all. It's too 