It depends only on what you do.
A boundary is a decision about your own action, not a rule you impose on someone else. "You need to stop asking me for money" hands control to the other person — if they keep asking, you're stuck. "I won't be lending money anymore" depends only on your answer, so you can hold it no matter how often they ask. The same logic works for time and commitments: you control your yes, not their request.
