What to expect if someone doesn't want to be together anymore? Nothing, right? There shouldn't be. Even when he has tried, does he then hope that the person he is fighting for will turn and melt at him? In fact, if you have hurt repeatedly and there is no tolerance anymore, then everything is gone. His efforts would end in vain if he intended to defend it.
Because when Tommy came to Becca's parents' house with his parents, Becca did meet them, but there was no compensation anymore. Becca's decision had been made, and she hoped Tommy and his family would respect that decision.
Becca also mentioned that there was no prohibition if they wanted to meet Arthur, or even bring Arthur to stay with them. Because what Becca wants is for her to be free from her life with Tommy.