Yes, I agree that it is most likely the hard wiring for co-dependency--undoubtedly coming from your early childhood. This could have been self-protective for you as a child if you grew up in a dysfunctional or abusive family. However, this same thing can be very determental in adulthood.
Hang around, and you will learn a lot about this concept, since almost everyone on the board has suffered the same thing to one degree or another.
dandylion