Just to 2nd what Mach says here, think of boundaries as defensive or protective, not punitive. The other party may feel "punished" if the no longer get the desired response from you they want or used to get. Your goal should be to make your expectations clear and set out the framework for having those expectations respected as well as create some accountability that is within your control. When I create or tune up my boundaries, I check my intent to make sure it is to care for myself and not to harm or punish the other party. A good therapist can help a lot here as a sounding board (as can this group). Not easy stuff and like any muscle it gets stronger with practice!