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I'm getting the impression that if you were to ask the narrator now, they would say that Rebecca was not, and had never been, much of a friend. If that's correct, you could try something like : ...
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#3: Attribution notice added
Source: https://writers.stackexchange.com/a/33356 License name: CC BY-SA 3.0 License URL: https://creativecommons.org/licenses/by-sa/3.0/
#2: Initial revision
I'm getting the impression that if you were to ask the narrator now, they would say that Rebecca was not, and had never been, much of a friend. If that's correct, you could try something like : > "... and at the time I believed she was one of mine." though "supposed" is more subtle - my suggestion is a more obvious flag to something you might have wanted to introduce more gradually. If so, you could avoid the idea of doubt at that point to make subsequent events more dramatic : > "Rebecca lived in the same building, and was one of our closest friends."