I have just written an article about this as well, to be published soon hopefully. I’ve encountered this phenomenon more since COVID. I believe it’s not just due to natural progression of relationships but the undue stress of this situation. It has meant profound shifts for many of us which can often lead to a reorientation with the rest of the world. I’ve been on both sides of this equation and more often than not, it’s the nebulous scenarios that sting the most. Closure, as you’ve discovered, must come from within and it seems you’ve done just that, taking care of yourself regardless of the who and what, fault or otherwise. It shows your inner strength. You’ll come out the other side a wiser person. 🙏