Speaking as an American guy, I find Japanese women's shyness and passivity charming at first. But, after a while, it just gets annoying. For instance, I love it when a woman makes the first move on me. It's hot. Maybe Japanese girls do it less than western girls because Japanese guys don't like it. I don't know. But, I think most American guys do like it. So, don't wait around for him and just go for it.