When we recognize things changing in our relationships, our first instinct can be to lash out and act from a place of rage or even abandonment. Don't rush to completely cut someone off, or don't rush to yell at them, to be angry at them. See if you can find a way forward and take time to adjust to you and your friends' new circumstances. Take it slow and try to integrate more solitary activities into your daily routine. And I think the other thing to do is treat your alone time as sacred.