You both have a magnetic attraction which can just as easily turn to rejection, if the conditions change. Both of you are very ambitious in your own domain and need a certain amount of control, and as long as both are working together towards the same goals this could be a great relationship. This can be particularly good for business or marriage. At times Cancer may find Capricorn boring with a narrow focus on mundane concerns, whilst Capricorn can find Cancer too emotional or over sensitive. Cancer's domain is the personal sphere so creating a safe place emotionally and Capricorn can achieve in the world creating a safe place in the world.