You only feel a heartbreak if you loved. The more you loved, the bigger the heartbreak. And this is great.
The difficult aspect of dealing with a heartbreak, particularly with the pain of abandonment or rejection, which can be physical, is that you’ll need to also heal physically.
Much of the pain you feel might require you to surround yourself with people who love you, like friends and family. If you are a hugger, ask for hugs. Use this as a positive reinforcement against the feelings of rejection that memories of your broken relationship might trigger.