I’m so sorry this has happened to you OP.
I went through a similar thing after a very traumatic breakup, I was part of a friendship group for nearly 20 years, and looking back now the support I was offered by one of the girls seemed to only be to get the latest and tell the others, as they’d then repeat things I’d told the one friend.
We arranged a holiday and I was made to feel like absolute crap for anything I organised so I pulled out and they didn’t speak to me for around a year. In that time, I joined Meetup, which is an app where you can meet people to do hobbies or whatever the group was doing.
it was lovely to be with people with the same interests as you, but no deeper friendship IYKWIM.
Anyhow the girls got back in touch but since then it’s very obvious they do not invite me to things, which they then talk about in front of me.
The final straw came when I met them for drinks and at the end of the night one of them said to me ‘you weren’t even f*ing invited, why did you come?’ Before storming out.
I decided there and then that these friendships are no good for me and have not engaged with any of them since (still on the group chat but they clearly have a different one as it’s not used)
once you accept and let go of the friendships, you’ll feel much better. You aren’t missing out on anything as these people don’t offer you anything or even make you feel welcome. I’d cut loose from it and have a think of days out with the kids/explore Meetup for things that may interest. You’ll have so much more self confidence once you break free of this toxic group!