Therrin, you should be getting a general feeling now of what most of us think about climbing with compromised gear.
I love cable-core flip lines, not for their additional safety but for the way they flip. They give you a false sense of security because people do exactly what you are doing. "But it cost so much, I CAN'T retire it!"
Retire it. Now.
I have personally come out of a tree by doing exactly the same thing. Thinking the exact same way that you are right now. "Well, shoot the cable's in there, it must be fine!" It wasn't. Twenty-five feet, flat on my back, just lucky it was a soft landing.
It responded just as Ekka stated. Once the rope broke, it slid right off the cable core and that was that. When you are repositioning your tie in points, there is that moment where you are relying on that one damaged flip line.
D Mc