As I have just posted on another thread, when a relationship ends, people grieve. It's natural and normal and part of the healing process.
Maybe you will get back together, or maybe not. Only time will tell ~ and time heals.
Emotions are there because we are human. Don't block sadness ~ let it out or you will feel worse.
I once read that there is a chemical in tears, which helps people to feel better if they cry.
If they suppress the tears, then that chemical can cause depression.
I'll try to find a reference to it.
Good luck!