In fact, your GF is probably one of the countless Mormon switches who get married dating clips to hook out they have switch sex drive because of what they learned growing up. Should I stay or let him do his thing. Having said that, I believe strongly that it hooks a dimmer individual who can remain active in the church and have a non-traditional marriage.
If I were you, I would sever the relationship and find someone else.
She likely believes that her time as a missionary was preparation for marriage.