Hey! I don’t think that it’s your fault.
Sometimes people just like to be alone or have a lot to deal with. I can’t promise if it’s the same for them but Sometimes I myself like to stop the chats and such things because I just wanna have some time with me and don’t wanna talk to others even if they are my close one’s. It has nothing to do with the others. When I put myself together, I start the conversations again. And It happens to many of us sometimes.
So, my advice is to wait until they come back to their normal self and stop overthinking.