Statistically, this is the exception, not the norm. Sounds like Dr Death has a very 'traditional' marriage where the wife's #1 ambition is supporting her husband and family, with any educational and career plans of her own very secondary at this point. No wonder he's thriving. (Is this what you aspire to?)
Do consider this. Pressing for quick commitment is a trouble sign, especially when you've expressed that you're not ready.
This is another really big consideration. His geography is not in his control; and once you apply to medical school, your geography will not be under your control either. In fact, both of you are very much at the mercy of external circumstances right now. (Unless you give up on your dreams and follow him around.)
Building a successful marriage is not just finding the right person. Timing and maturity are also very important factors. You can meet the right person at the wrong time, and things just won't work out. Frankly, this doesn't seem to be the right time for you. To achieve your dreams, you'll need to focus on your schoolwork and outside activities. You'll need his encouragement and support -- not pressure to get engaged, get married, spend more of your time with him, move to where he's stationed, have a baby, etc. He can support your dreams or work against them. But if he's working against them, he's not the right guy.