I want to ruin my mom's relationship with her boyfriend. Do you think I should?
Why do you want to ruin your mom's relationship?
I'm jealous of my mother's boyfriend.
Think about your mom and what your actions would do. It would hurt your mother and likely damage the relationship you have with her.
I don't care, I want her boyfriend to leave her.
It isn't your place to interfere in your mother's personal life and your actions will only cause more problems.