Since this is a Bipolar forum, let's be clear for our readers that self-sabotage does not stem from Bipolar illness.
How does self-sabotage punish others?
I can see if you are financially tied in with another person, your self-sabotage in the financial realm may negatively affect a partner.
Yet, outside of that, how does self-sabotage punish others?
As for changing this behavior, I'd suggest working on this with your therapist.
I wish you success in your desire to change this behavior.

WC