Books about (overcoming) not having a friend group, exclusion, drifting apart

Hi all, I’ve recently been going through a rough patch with my uni friend group, where it’s come to light that I’m not really considered an integral part of the crew anymore. I am also the only one of us who lives 2+ hours away. I understand that these things happen when you reach your 30s but I hadn’t expected it, and it’s making me feel like an insecure 13 year old again. Luckily I still have a lot of good friends around, so it’s not like I’m on my own, but it doesn’t stop the hurt.

I’m wondering if you could recommend me books (fiction or non-fiction) about (dealing with) not having a go-to group of friends, about drifting apart, about social exclusion. Can be self-help but I generally do not enjoy those, though for this topic it would make sense.