Recently widowed dad dating again

Ky

My boyfriends dad just lost his wife a little over two months ago from a long hard battle with cancer and he start dating this lady a little over a month after she passed and they have been together for a month now and he is hiding it from his kids big time, lying to them, making up excuses, saying he can do what he wants he’s an adult if they ask about him always being gone, and getting angry when they talk about his wife. They can’t help but be super angry with him and it is almost like he moved on too fast. Is it okay to feel that way? Or do we all need to calm down? We need help because we are constantly angry with him and have lost all respect but we don’t know if it is over exaggerating. What are your thoughts?