Relationships don't require 'arguments and fights and makeups' to be real. And if AI girlfriends offer 'ideal relationships', how is that not 'good'?
You are conflating what people actually want with the artificial drama of TV shows and Hollywood/the messy scenario of reality. If people can pay to get their fantasy girlfriends/relationships brought to life, they will, and it will be successful especially if all forms of conflict/relationship dissatisfaction can be avoided.