I think that failing to assertively say "No" or set clear boundaries can lead to numerous problems. It's essential to recognise that lacking these boundaries can be quite costly. Rather than resorting to lies or excuses, it's important not to fear disappointing individuals who only seem to remember you when they need something. Instead, choose to decline their requests immediately. Remember, while empathy is valuable, it should be accompanied by well-defined boundaries to avoid self-destructive consequences.