Boundaries are the rules and guidelines of what is and isn't acceptable in our lives, and in our relationships with others.
Where do you need better rules or guidelines in your relationships? You teach people how to treat you.
The number one way to improve every relationship you have, don't assign responsibility to other people for how you feel.
According to Stoic philosophy, everywhere at each moment you have three options
to accept this event with humility
to treat this person as he or she should be treated
(Especially if this person is you)
to approach this thought with care so that nothing irrational creeps in
The only people who get upset when you set boundaries are the ones who benefited from you not having any.
The people who are meant to be in your life will understand that when you set boundaries, it's to keep them in your life, not kick them out.
This is Being more. This is love. Be more.