Unfortunately I've been sort of seeing a girl who is basically a real deal Mormon. For reference we're both in our mids.
She never mentioned TSCC. Then she took a vacation to Utah and in her letter to me she stated that she had seen the Temple, and I never heard from her again.
Many, many lapsed Mormons catch the true vision of the gospel at some time in their lives and desire to repent and become observant again. This is wonderful and in accordance with the desires of a loving Father in Heaven, but it can turn a marriage on its ear, if the spouse is unprepared.