I agree with Byz and Belle, (not that I disagree with shez {sorry shez}

) depression was the first thing I thought of when taking your post apart and putting it back together.
I was doing my mood tracker journal today and I actually put in there:
"I don't know whether I really love my partner or if I need him around to feel loved"
Though I realised I was depressed and had a good bawl about it because I adore him and I felt guilty that he loves me with all my faults...I want to be the best of everything for him and I feel somewhat broken and guilty because I have long periods when I "feel nothing" I "don't feel it"...
But if you don't feel sexually attracted to her there is nothing that can be done about that at all. It's a sexual thing that urges us on to procreate and if it isn't there you may as well be in an arranged marriage...loveless but dependable...yukko!
Good luck with this, I hope you can work it out and we'll support you in the meantime,
Rhiannon