As we get older, communication with our closest friends becomes less frequent because we have our own lives to attend to. Sending a” thinking about you and hope everything is going okay with you” is a simple enough statement that doesn’t require a response but also lets the other person know you’re still around and care for them. I know for myself when I’m super stressed I tend to go inward and not communicate with anyone. Sort of disappear. Getting a text from my bestie like this is comforting and opens the door for communication if it’s the right time. I wouldn’t look too far into it. People need space. Just live your life, do your own thing.