My late, and very wealthy Swedish friend had the same Thai girlfriend for about 20 years. He said that the difference between her and a Thai lady was that Nah would get up early every morning to make his breakfast, whereas a Swedish lady would never (or be unlikely to) do that.
Unlike in the West, Thai ladies haven't been raised to believe that they should be the same as men, so more 'traditional' roles of man and wife are more possible?