I experienced something very similar. I was very lonely and very depressed at one point in high school and while sadly walking home one evening, a group of 5 or 6 high school girls enthusiastically approached me at a nearby shopping area and asked if I was ok. They asked who I was friends with and told them no one, really. Which was true and not just me being dramatic. They all cheerily told me they’d be my friends. Even though I mostly knew it was just lip service at the time, it still hurt to hear it and have it be dangled in front of me like that. Obviously I never heard or saw them ever again. This was right before cell phones were popular with kids so it wasn’t natural to ask for numbers bc most of us didn’t have one.

As an uplifting note, I’m happy and much less lonely 20+ years later :)