HAL is a wise man... I wouldn't beat him up over what he said, because it's true. If it's the right one - there's give and take on both sides. I got out of the Marine Corps mainly because of my wife (an active duty Navy LCDR), but when I missed it - she encouraged me to join the reserves, even though it would be challenging. She's my best friend, and if I ever have to choose between a job, flying, or the Marine Corps - I know which one I'm choosing. What HAL said is true, you have to answer that question with yourself, who/what do you choose?
She may be flipping out now, however she has to answer the same question with herself about you. Which is more important to her? You and your happiness or her big dream wedding? The give and take is going to exist whether you're in the military or not.
Oh, and to give you an insight (mainly for her) as to what military married life is like - my wife just found out yesterday she was going to be deploying today. We were up until 4 am getting everything packed and ready, and I dropped her off at the ship at 6 am. I don't know how long she's going to be gone, and she's slated to deploy again in September and miss Thanksgiving, Christmas and New Years. It comes with the territory, and she's more than worth it - this I assure you. So, are you worth it to her?