A woman doesn’t want a man to lie to her about important matters. She wants to be an important part of his life – the most important part, in fact. She wants to know the things that are going on his life and she wants him to have trust in her. As far as she is concerned, they are one – his life is her life.
She wants him to want to share in his pleasant experiences and memories. She also doesn’t want him to feel that he has to lie, because when that is the case it usually means that he was stepping out of line, making poor choices and mistakes. On the other hand, she doesn’t want the truth in all circumstances. Brutal honesty isn’t wanted.
If she asks, she looks great, she looks beautiful, the fact she gained 15 pounds doesn’t bother you, her new haircut makes her look even cuter. Now that I think about it, the only thing you should really lie is about such shallow matters as appearances. We all look like sh*t sometimes – but she doesn’t need to hear you say it.