In the credits song "Want You Gone" of Portal 2, there is one line where the text is
[REDACTED]. The lyric is either "I'll stop feeling so bad" or "I'll stop feeling so glad", but even after listening multiple times I still can't tell which one.
Can anyone provide evidence for which one it is? Or is it ambiguous on purpose, so you don't know whether GLaDOS loves you or not at the end?