Your bf has dependent children. 8 months seems early to be bringing a new gf to Thanksgiving dinner with his children and dad. To each his own, but to me this is a foolish test of his commitment to you. And why does being in a committed relationship prevent you from having Thanksgiving dinner with others? He has done nothing which indicates he isn’t living up to his agreement for a committed relationship. You seem to hold a strange definition of ‘committed relationship’ which you should discuss with him, especially as to how it relates to his children.