Boundaries and Buddhism Further to this question Do Buddhists adhere to the Western concept of “Boundaries” to protect oneself? Or is the creation of boundaries an obstacle to enlightenment because of its avoidance of future suffering? Are we called to give of ourselves without bounds, even to those without gratitude for our service? How does this apply to emotional, financial, and service to others with our time?
The Pali Canon position (e.g. Sedaka Sutta) is that :


  [Correctly] Looking after oneself, one [implicitly] looks after others.
  [Correctly] Looking after others, one [implicitly] looks after oneself.


The Mahayana position is unquestionably that of service without boundaries.

That said, both the Buddha of Pali Canon and the contemporary Mahayana teachers insist that taking care of oneself is a prerequisite to being able to take care of others. To use a modern analogy, first put the oxygen mask on oneself, and then help the children.