You write that you have something akin to a great friendship, but that the sexual attraction spark isn't terribly strong. I have been in the same situation in the past.
I figured that with all long-term relationships, the spark dies down eventually, and after awhile it's the deep connection that matters, so I decided to quiet my nagging doubts and be happy for what I had. I became more unhappy in the relationship, more doubtful, and I eventually ended it, but by waiting and dragging it out I caused my then-girlfriend much more pain than necessary; I still feel bad about it years later.
I believe that even though raw sexual attraction and "buzz" may not last forever, it's an absolutely necessary component (along with trust, friendship, love, and other qualities) at the beginning of a relationship to allow the couple to become close enough to stay together long-term.
I'm not advising you to break up with her, but I am advising you to figure out whether this can work for you sooner rather than later. You may worry about hurting her, but it's going to hurt a lot more if you wake up one day 10 years down the line, with two kids, a house, and a life together, and decide that you just can't take it anymore.
This may just be a case of timing or perspective or "the grass is greener", and after some time apart, you could very well decide that she IS the one. All I'm saying is don't commit until you feel it deep in your gut.
I wish you the best of luck.
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