I think you should start by having some very honest conversations. She might want to follow the 'virgin until marriage' part, or she may personally decide to forego following that in secret. If you think your girlfriend's resistance to being exposed to anything critical of Mormonism sounds cult-like, you are right. You'll take out the trash, coordinate all the home repairs, pay all the bills, do all the yard work and generally work your ass off until you're emotionally and physically drained. How will your spouse feel about that in 20 years.
There is rarely minute that goes by where I am not thinking about him in some way. He should tell her that he will never convert, and that if she will not be happy unless he does, the relationship should end. Everything about the loneliness and bourdon of raising the kids solo resonates. It sounds like if we were to have a happy ending, it wouldn't be quite so happy because of how we raise our kids or how the rest of the family would treat me forever We'll discuss it again in more depth now that I have a few specific concerns about what our future together might look like. Though, not everyone is looking for a free lunch out of a marriage. Then, do any of the above morsels of advice matter.
She has encouraged me to read LDS. Women do not get to hold the priesthood and function in an equal role with men. I'm really glad to hear a few of you have stories of happy interfaith relationships, or leaving the church together, so there's always a chance. You'll have to get use to the running late, the tire man, weeks without communication, dinner alone, and unanswered texts and phone calls. Things have worked out pretty well with us so far. These same principles have helped build strong, successful religious communities for thousands of years. Again, reiterating it, don't expect a decade's worth of time with her, but enjoy her good while you two are together. My beliefs have changed several times in my life, but not those things, so my interfaith marriage has lasted 25 years.
Mormonism is a lot more controlling and has a lot more downsides. No one could compare to the man I married. Due to the very long hours away from me and our children, my husband spends alot of his free time on the internet.