So I’ve got a new friend group and they text each other outside the group chat but not me separately. Why is this?

So none of us knew each other 2 months ago and it’s going pretty well in school but outside of school they don’t text me.

Edit: please don’t tell me to make new friends as this is the same thing that has been happening for the last 2 years, we vibe in person and become friends but then never contact me outside of school or football.