You always have to set boundaries and even then, boundaries are shaken and have to be rebuilt stronger than before with certain people.
Always set boundaries. It’s called self preservation & self love & self care. Without self, how can we be expected to help others? We must protect our own temple before attempting to help rebuild others. ~ Amber Van Sweden
Taking advantage means a selfish way of thinking only himself or themselves. It doesn’t help at all. The sure thing is to learn to say no if someone makes you feel uncomfortable in a given situation or decision learn to trust your instinct to avoid being abused. ~ Ram Angeles
People will notice the change in your attitude 
If people are meant to be in your life, they will catch up 
Let go of the people who dull your spirit 
Always tell people how important they are