I think your relationship is a friendship. A wonderful, loving, compassionate relationship. You turn into such a pussy with her.Question. Were your mother and father lovey dovey when your were growing up? I think you are an emotional amoeba.
I would be jealous of other girls too, if you weren't fucking me.
You said to me that we wouldn't work b/c if the sex was gone, I wouldn't stick around. I think, speaking totally neutrally here, that there is something else out there for you.
You hold onto her b/c she is "what you want in a wife". There are a million fish in the sea. Someone out there is a combination of friend, companion, lover, soulmate. You have to give yourself a chance to find it. You seem so scared to be alone. You are 28, sexy as hell, talented, smart. You can't have a marriage with no passion. Or can you?
Keep looking.
p.s. People do change. People grow. People learn. "spark" you either have it or you don't.