It signifies the end of a relationship or a chapter. The speaker is no longer willing to be the "enabler" of the other person's guilt.
The phrase (I will forgive you only when you forgive yourself... Go!) is a powerful dramatic monologue often associated with the renowned Azerbaijani actor Nurəddin Mehdixanlı .
Mehdixanlı’s performance emphasizes that the harshest judge is not the person we have wronged, but our own reflection. Emotional Weight and the "Get" (Go)
External forgiveness (from the victim) is often sought as an easy escape from guilt.