Ned calls Nancy three times during the game. If you try to call him, most of the time you get his phone machine, so you might as well just wait for him to call.
Hint 2
The first call is after you've visited ship, pub, and culture center. You can be either defensive or apologetic.
Hint 3
The second call is just before you go into the cabin the first time. It sounds like Ned is either in deep trouble or just, you know, being a guy.
Hint 4
The third call comes in the last third of the game. When Ned lays his heart open, you can either respond in kind or ... be cold. Which would Nancy do really, do you think?
Hint 5
With all of these, it's up to you how to respond. If you want to hear Ned's poor longsuffering heart actually snap in two, be standoffish in that third call.
Hint 6
After the third call, you can now call Ned and talk about other stuff if you want. Ned has some intelligent things to say about your case, so it's worth doing.