Life is too short. Best wishes to those struggling with these big, life-altering decisions. Love the man you are going to marry- warts and all he loves yours as well. The church creates massive guilt and shame in children and adults usually through sex related shaming. You have to choose what's right for you, but you have to figure it out. When you work this hard, you need to play hard. This brings me to the thorniest bit: If your wife is Mormon, your kids will be expected to be Mormon. But daytime game is the key.
As for me, I recall spending a lot of Sundays at sporting events with my dad. Take the crazy and add a ton of even crazier shit on on top and Your girlfriend literally believes in a book of scripture that was produced from a rock in Josephs Hat. I only hate one thing in the planet, and that's the Mormon church. The Church of Jesus Christ of Latter-day Saints teaches that all sexual relationships outside of marriage defined as the legal union between a man and a woman are sinful. So basically we were lies to for years.
Every bishop, new set of missionaries, home teacher, etc. We often have issues because of his relocation every year. If yes, do you promise to not proselytize to me and let me drink a simple cup of coffee in my own home. When she goes on a mission, she will go through the temple which means she will be wearing garments. They are taught to refrain from smoking, drinking, or experimenting with drugs.
God will help you both work this out. One red flag I have for Mormon girls is if they drink coffee. Finally, the decision of whom you marry is really between you and God. I work part time from home and am involved in a church fortunately, but I miss my husband. We tried discussing his list a few times, but it only ended in arguments. Sorry you had to go through this, but it's for the best if she's about to leave on a mission. It would likely be seen as a trial in her life. This is a very delicate territory, so tread carefully. I have no idea if he stayed. Cold approaches on Mormon girls are challenging.