Can ADHD marriage make nons too empathetic?

After a conversation with a friend I started to think about empathy. My friend has a healthy integrity. She has a respected position in a caring profession. With all her resourcefulness, she is also kinder than most. She humorously described some interactions she's had with close relatives lately. She's intrigued by not being understood by them at all. Her relatives seem to mindlessly take advantage of her generosity without showing any consideration for her needs. I recognized this. During two decades with an increasingly vulnerable and dysfunctional partner and later children, other people have often benefited from my initiatives but not chipped in. I've become more and more confused, ashamed at my exhaustion, hurt when not understood, and bad at asking for help. When overlooked, I've felt resentful. During this time, I've also developed much more empathy than before.

It seems my friend and I as professional caregivers share an attitude to empathy. We use it as a tool, it shapes us, it's part of us and what we value and do.

But my friend has not been laboring with psychiatric illness on the home front. While she can pause her empathetic work for rest and private rewards, there really hasn't been much of that in the ADHD marriage. 

I wonder, can ADHD marriage make nons too empathetic? I don't have any taste for martyrdom and dislike unbalanced relationships. What happened was just a lot of time spent with a troubled and different mind. Do nons maybe stretch their empathy so hard to understand their partner, that they break something to do with integrity and self-preservation? 

And also, after that break, when integrity leaks and invasion follows: what boundaries do we need for other people who like to lean too much on us?