Could you be in a relationship with a ruthless person?

Could you be in a relationship with a ruthless person?
All of the women I have dated demonstrated themselves to be more or less ruthless when they needed to.
I thought I was a pretty ambitious person but I always discovered to be way out of my league with them on that. It's a bit scary, but it's also something that makes me admire, respect and get attracted to them
What about you?
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It is realistically possible that someone who brings so much light, positivity and happiness in your life, and genuinely means to do that; can also be so dark and frightening at times?
Could you be in a relationship with a ruthless person?
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