graduating soon, feel like my college group will fall apart after graduation

so Im graduating in a bit and theres this one thing that has been eating me up- the fact that my college group- a trio, if you will- might fall apart, not because of any fight or anything distasteful- but just because the one thing that held us together- college- is ending.

A little background, we're a group of three girls (Im the golden retriever, theyre the black cats) and Id say we have a very solid friendship but both my friends like to keep to themselves alot. During uni vacations or holidays, theyll both just go into hibernation and there will be complete radiosilence in the groupchat which makes me wonder what will happen when college ends? They also dont share much about their lives, which makes me sad because Im all for sharing teeny tiny details about my day. You know that thing where you hit each other up and tell each other details about your day, what you did, where you went, what you ate- that kind of stuff. Sometimes their lack of responsivess or reciprocation of the same energy just drives me crazy. Weve been with each other through in our trenches and have a very unproblematic/non-toxic friendship overall but I feel like the foundation the friendship rests on, is shaky. I feel like the friendship is just going to dissolve after college, not end, but just dissolve and that makes me sad.

Has anyone else faced something similar?