The confrontation
Feeling confused and disrespected, he decided not to keep his feelings for himself and confront his girlfriend about this. His stepdaughter may have turned into a bridezilla, but he had hoped to get some common sense and support from his partner.
It turned into an ugly fight though when the woman sided with her daughter. Before, he was feeling angry and offended by his stepdaughter, but this fight made him realize that even his partner had no respect for him. He started contemplating his place in this family.