It doesn't have to be consciously intentional to count as manipulative.

I had a too long realtionship, fluctuating between romantic and platonic, with a borderline. At the time I had a dependent and easily manipulated personality. I wrote this tanka a couple of years ago:

"You are the greatest

You’re disgusting I hate you

Wait please don’t leave me

Thrives sowing chaos around

Rollercoaster ride from hell"

decoded here: https://medium.com/know-thyself-heal-thyself/twisted-relationships-6c148e17f0d8 not that you need the decoder but other readers might be interested

You mention boundaries. She had boundaries and I wasn't allowed any. When I had the audacity to confide in a friend about our relationship, she decided it was reasonable for her to use my email account to send a picture of my erect penis to a woman in my office.