I became the same way...practically overnight. I had a longtime friendship with a narcissistic woman (friends with the whole family), and I couldn't do it. Couldn't focus on her all the time and worry about her and let her stomp my boundaries... she's mostly out of my life now--in as much as I want.
I did the same with some lesser friends/acquaintances, and I only expend energy on people who behave in a healthy way with me.
I jokingly say to my friends sometimes--remember, I gave up toxic people when I signed divorce papers...
AND THEY'RE EVERYWHERE!
