Answer:
Jeff is in a relationship in which he has unrealistic expectations of how his girlfriend must act in order to be worthy of his love. He is unwilling to share his thoughts and feelings when she tries to discuss the situation with him. According to the Coreys, Jeff is most likely to be a person whose love is inauthentic.
As Jeff considers that his girlfriend will only be worthy of love if she fulfills his unrealistic expectations, hence Coreys will consider the love of Jeff to be inauthentic.