I havent read the whole thread, as I've got to get up and do stuff rather than just sitting on MN
But me too... and i had a lovely huge happy friendship group once upon a time.
Now I see them all together going out, enjoying thierselves and im not included, im coming to peace with it, but i had to come off social media etc, as it was just too hard to cope with.
I dont know exactly when my popularity started to nosedive but it did, and now i have two friends, that I know im not in thier top friends groups, they are both wildly popular and have so many friends they are never not busy.
Example
F "I cant do x y z today as I've got plans at 5"
Me: "oh no what a shame, what you doing later?"
F : " X couple is coming over, with X friend, then X,Y,Z are coming over for X"
Me: "oh lovely, have a nice time. How is X Y Z"
What I really wanted to say is, why doesn't anyone want to see me anymore? I would like to come too.
Its so sad. Im so sorry to those who are lonely too. Im trying to convince myself a life without friends is happier. Im not sure.