I was looking around for a good definition of "empathy" since, although I know what empathy is, I admit I would have had trouble articulating it in writing.
On Wikipedia, I came across this sentence which, to me, says it all:
Empathy is the key cornerstone in genuine human relationships. Empathy is conscious. It means one with empathy feels compassion, while those without do not take into account other people's emotions
I certainly don't think that being empathetic makes one co-dependent. I'm curious as to why you think it does...?