A man's love life and choice of a partner is totally up to him. It's not easy to say why a man chooses one woman over another. There are several factors involved, but keep one thing in mind- men want their partner to be compatible with them in different ways. It doesn't mean that attraction and choosing the right woman should be a complicated game. They want it to be simple and straightforward. You just have to genuinely love him and show it through your actions.