Just because your getting married does not mean your dreams are gone and your traveling has to stop. You've been together for three years. Will your relationship change because of a ring on your left hand?
The best part of marriage is that you have a partner enjoying the same activities for the rest of your life. What an awesome thing. Your best friend at your side.
No one is perfect and we all have our demons. At least he is taking steps to improve himself, more then a lot of people do. He excepts you, except him.
I wanted to finish college but it didn't happen. Instead I was able to see part of the world I never thought I would ever see. I have two awesome kids I would not trade for all the tea in china. My path has taken me on an adventure I never thought would happen. Was it in my plans? Nope. Do I have regret, not a one.
Cold feet is normal. If you love him and see yourself with him for the rest of your life....sit back and enjoy the ride.