It is one of the possible match-ups according to MBTI - the opposites attract kind of thing. Our opposite personalities view the world through quite a different lens, which is intriguing and serves as a nice catalyst for the relationship. But there is always this hidden potential for misunderstandings as well, for the same reason that two people will see the world quite differently. In any case if you are having a good relationship that you enjoy, then why worry about what MBTI says.