Nudge Your Feelings
Sometimes feelings need a little nudging in order for us to acknowledge and process them. It's like they are seeds stuck in a shell, and we need to scoop them out in order to free them.
Some helpful exercises for scooping out the seeds of rejection and sadness from a terminated friendship: looking through pictures of trips together or graduation from high school or college, listening to songs that trigger memories, or frequenting the coffee shop where you used to meet. These all help you to mourn an ending.