Reason being - he wants our relationship to be spontaneous like it was before the pre-med things really "kicked in". Posts from people who have your same problem occur on a regular basis here on RFM. That was hard on my relationship and I had to give up on my dream of being a computer programmer. A lot of Mormons escape that pitfall and can put people first. This makes me so sad. Of course, your parents will care most. The church is very important to her. That's in the footnotes of the polygamy in kirtland and nauvoo essay. It sure has its ups and downs. I suggest you develop a busy calender so you'll be occupied because you'll get dizzy thinking in circles.
My husband is a surgical oncologist. My husband did his best to do the same though a medical career makes it a challenge. I also didn't want to push him away by overwhelming him with talks about commitment when he's already stressed. I tell her there's no pressure and we'll just see how things play out. Let me say this so you can get an idea of just how crazy and how much your girl friend is into the Mormon religion: These are known as "garments".
Maybe watch "Going Clear" with her. It's very noble but still demanding. Now it's easier, as they are older, and he's making more time for them. All those are reasons to give the church some elbow room but they are not reasons for actually staying. I am a lawyers wife. But can't he send me a text just once a day or every few days to let me know he's thinking of me. It CAN work, to be frank.
Word to the wise, wait a day or two. They do exist and you deserve that. A forum for ex-mormons and others who have been affected by mormonism to share news, commentary, and comedy about the Mormon church. Maybe about a year ago. It's also possible that deep down she's like many of us here, and her shelf will break and she'll want out.