Well sure it happens sometimes , it’s often a gradual decrease in communicating tho, someone moves or change of jobs , marriage etc ...... but if your really close to someone then there is a deep feeling of wanting some closure. It’s a natural want and need most people can understand.

In the OP’s situation they had a very close relationship and she simply vanished. That leaves questions and doubts and an empty feeling which results in his questioning his worth.

Life is tough, I think we all need to just be kinder to others.... at least that’s how I feel.