Bill didn't like it. He didn't like it one bit. Dom deserved so much more than insecurities and not knowing, she deserved to be loved. In the end it was all he wanted for his kids. For them to find someone who loved them as much as he loved their mother, as she had loved him in return. Forget the fairy tale, forget the wedding, he wanted them to have the life.
Still, in spite of that, he couldn't argue his point when she asked him to support her. Because how could he not support her? It was her life, her decisions, even if he didn't necessarily agree with them. "Just be careful," he said. "And if you need me, you know where to find me." And if he hurt her he really would have his balls, but he didn't add that part.