Every boyfriend or girlfriend is perfect and every husband or wife is imperfect.
1) Expectations are nill in a courtship.Expectations are sky high in a marriage.
2) You dont stay together.You have that breathing space away from the other for yourself.
3) Fear of losing the other is higher.Fear of losing the other is nil.
4) The attempt to impress and being impressed is on.You know the other like the back of your hand.