Walking away
After making up his mind and cutting off from his poisonous girlfriend and her daughter, he realized that he made the right choice. He got a copy of the wedding plan, only to find out that the music list was her biological father’s favorites, as well as the food, including ingredients that he’s allergic to.
That was the last proof he needed to understand that the people he considered his family for the past decade didn’t really care for him, but rather used him for his money. Throughout this entire process he experienced grief and anger, and now he no longer felt sad or sorry, but relived to know he made the right choice.