his EX doesn’t belong to the family anymore; therefore she shouldn’t appear in the dinner party. If LZ’ boyfriend believes his EX is a part of the family, or wants to put his kids superficial happiness on the priority. Then why does he bother to date someone? Now, LZ feels uncomfortable for his arrangement, should he consider not hurting his girlfriend’s feeling? On the other hand, If LZ wants to invite her EX to the party as well, do you think her BF would say OK.
BTW, after my hu*****and and I got married, my hu*****and’ s EX only has been our house not more than three times, that is included the time she pick up her younger son, and stayed for dinner( I wrote about that last year) When my two step-sons were younger, they spent two days in our house in every two weeks. My hu*****and would meet his EX somewhere in a location where in the middle between our house and her place to pick up and to drop his kids. He, his children, and his EX had never given me any hard time at this point.