Dear Emma,
Get to know his family. Observe closely the mother-father relationship. These are his role models. Observe closely the mother-son relationship. This will give you a hint as to what he will expect of your relationship when "the honeymoon is over," and at some point - sooner rather than later - it will be over. Alas, all is not lost, but this is a topic for another day.
Yours truly,
Auntie Agony