The context of the following conversation is Ash told Sydney something about the movie but he stopped her before she spoiled the ending.:
Sydney says Can you believe Ash almost ruined the movie for me?.
The friend responds I know, but it was so good and she was really excited..
Sydney responds She should have asked me if I had watched it or not first..
The friend responds Yeah, she is known for giving away spoilers!.
Sydney responds Well, I'm just glad I stopped her before she told me too much..
The friend responds Good thing, huh?.