Once last piece of advice to you girls who are "dating" or "engaged to" a doc: Don't confuse "dating" and "engaged to" with "married to" - get the ring on your finger and seal the deal. I suggest to run as it will not get better. I am married to a DH and what helps me the most is knowing my whole life revolves around him and medicine always come first. Being married to a doctor is a difficult thing to balance. Over the span of the last year though, things have slowly changed.

If you do believe it fully, are you not really going to want him to make the conversion ultimately. Mormonism, like many extreme religions, often stunts the growth of its members. Because people who have problems with interfaith families must needs shortly become a thing of the past.
I dated a doctor who was into me and saw me frequently. They require a healthy dose of flexibility, nontraditional expectations, and teamwork You aren't always gonna have a Christmas etc I can understand it would be hard to understand the cues you are getting if you have no basis for that lifestyle, but really think it over. Recently though she has been quite distant, although this may be due to a combination of reasons - such as family sickness and now being on nights. She might want to follow the 'virgin until marriage' part, or she may personally decide to forego following that in secret.
Also, I know a bunch of Mormons that say they are, but don't act like it. Needless to say, his top choices were not near my family and friends. Take a breath, stop and think, is it worth destroying so many lives so you can step in and take the rewards after someone else does the hard work. Should I jump ship.