Thanks Rad- I'm not sure if I'm clear about the Libra part. Are you implying that the natural square to Cancer means that Libra as well as Cancer both correlate to co-dependency? (ie the relationship between internal security and the relationships in our life).
Ari - Cancer represents the need for emotional insecurity. The person desires to feel secure. Libra represents our relationship with "the other".
The intent in Cancer is to learn to feel secure within self. When that has not been achieved, the desire to feel secure is then projected onto "the other" (Libra), believing it is "the other" who is causing me to feel secure when in reality the feelings of security are coming from within myself, and only appear to be coming from "the other".
When this insecurity/projection dynamic is mutual between two partners, they only feel secure when they are with each other - which is the definition of co-dependency. The evolutionary intent is to trigger the Libra polarity of Aries. Aries, like Libra, squares Cancer - the intent being to find the solution to Cancer's insecurity within Aries - myself. As this is learned, the Libran codependent tendencies can evolve.