You can't truly love someone without being vulnerable. The risk of being hurt or disappointed is great. So what, get over it. The reward for being fully committed is so great and you'll never know it without allowing yourself to be vulnerable.
Libby, That's the end of my two cents. You hit some real hot buttons for me. I hope what I've said reinforces how right you are. As I said in the first comment, I'm always impressed by how you understand human feelings and emotions. I should also add behavior. Great piece.