Maybe they also think that a foreign woman might expect from their man that he’s telling his feelings straight out several times a day, something a shy Japanese man just won’t do.
Another problem is that many of the Japanese men seem to be afraid of their English ability and thus fail to approach a foreign woman.
For some guys it really gets to their heads and they start bragging about it like crazy as part of the superstar syndrome.
The complete opposite is the case for (Western) foreign women in Japan.
Consequently they don’t see the need to study Japanese, because their wives will take care of it all.