Blackie,
If you define desire as your sex drive as it comes from the heart (iow, wanting to get it on with *that* person instead of just wanting to get it on with their body) then it's easy to see why yours is gone. Your heart is broken and when it begins to heal, I suspect that some lucky lucky lady will find herself the recipient of your horniness/desire/attraction/attention. Until then, I imagine it will be lots of itch scratchin.

Take care,
HP