When you notice people you cared become distant from you, what do you do? And what are your thoughts?

So becoming distant in my head means they need space. If I notice it's gone on a while I will reach out.
If I don't get a response even if it's just a friendly message or I need some time. I kind of just let people be.
I can honestly say it hurts to lose friends and relationships, but I learned that you can't force anything or anyone to stay.

I definitely think about where things went wrong, but overtime than questioning subsides.