Well, I don't want to speculate on your situation with another person because it's none of my business. I'm just saying, take all comments which could possibly be interpreted as a compliment toward yourself (or your in-group) with a grain of salt. I've known a lot of foreigners who date Japanese people who strut about on top of the world because of the sweet nothings their partner has whispered in their ear, and then later wind up crying into their beers (or spending years in unhappy marriages) because it turns out those things weren't true.
Which is not to say that all Japanese people are dishonest. There's just a little more tolerance here for fawning flattery as a tool for ensuring smooth social relationships, and when cross-cultural communication is involved with one person who isn't a native speaker, both parties have a tendency in my experience to not be very good at spotting when the other is being less than honest. And it's also not to say that all cross-cultural relationships with Japanese people are doomed to failure. I've known plenty of people with successful relationships with Japanese partners. But those relationships tend to have participants who aren't into the other just because of their race, they were drawn together by some other source of attraction.
I don't want to sound like I'm calling out a friend I've never met of a person I've never met on the Internet for being dishonest. I'm just saying things may be more complicated than the picture you're getting, and even if the woman you know of is expressing her sincere opinion, she may not represent the majority of Japanese women who are into white men. In my many years living here and with my connections to Japanese communities living in the US, I've encountered an awful lot of Japanese people (male and female) who just want to date someone with real blond hair. Or have a baby with blond hair.
