How do you know when it is time to let go?

I am… or was? A collared sub by an amazing Master. We were very long distance, and I thought everything was going good until one day coming up eight months ago now… they just stopped talking to me. I have no way of knowing if something happened to them or if they just wanted to end the dynamic.

It feels strange after five years of friendship and three years of being their collared submissive that they would just disappear like that. I still get my hopes up every time I see/hear my phone go off and still feel the disappointment when I realize it isn’t them.

When do you know when it is time to let go?