I heard that a study was conducted where they checked the health situation of parents who had to establish boundaries for their children. They discovered that the feeling was as someone who was about to have a heart attack.
Meaning - the parents felt powerless and sick.
We live in a generation where the boundaries are falling everywhere.
That is Facebook and twitter. Everybody wants to follow and be followed every second of the day.
The most important thing to establish in every relationship is boundaries. Not too close - but never too far.
Big topic. Once gave a long lecture about it.
Then I retired [or was retired:-)].