Ending things with a real conversation instead of disappearing is basic courage people skip.

Disappearing is easier because the hard part happens to the other person instead of to you. They get the confusion, the rereading, the wondering what they did wrong, while you skip a five-minute conversation. Ending something properly costs you those minutes and gives them something they can actually close.

If you are done with a relationship, a group or a commitment, say so in plain words. Short and kind beats long and detailed every time. You are not required to explain everything, only to be clear that it has ended.