Does the "no contact" rule work?

[God of Thunder]

We've all had those breakups! The ones you didn't see coming, or the ones you did and didn't do anything about it! For whatever reason though, your friends, family, and everyone else always seem to say...

"Do NOT contact them, and in time, they'll come running and begging back"

This always seems strange, however, I think it generally holds true. Once you're gone, you start to mean more to that person. Once you know longer think about it, they tend to come flying back.

Do you all find this to be true or not?