Why is it that all the women I develop an attraction towards turn out to be spoken for?
Maybe you have an unconscious tendency to feel attracted to that kind of women since it means you won't actually have to get into a relationship (as in, deep down you're actually afraid of intimacy/relationships). Maybe you just have bad luck. Keep looking.
. But neither of these particular uses were necessarily in line with the dictionary definition, and I didn't want you to be led astray.