You shouldn't sabotage your relationships.
Mitch is not getting along well with his girlfriend and wants the relationship to end.
Mitch needs to decide how to proceed in bringing his relationship to a close.
Mitch talks with his girlfriend and explains his position to her, after which the couple parts ways.
Mitch starts behaving in a way that is sure to start arguments and cause his girlfriend to leave.
The relationship ends as amicably as possible and both parties maintain a civil relationship.
His girlfriend becomes angry with his behavior and leaves him in a very uncomfortable and nasty exchange.