How would you suggest handling a man or relationship with a man who isn't used to thinking about how his words and actions might make another person..

I would leave/stay away from them because there’s no tactic to get someone to be less self-involved. Not being self involved requires empathy, self-control, strong sense of personal responsibility and willingness to take accountability, executive functioning skills etc..

The only exception to this is if they are a child with a brain and sense of self that’s still developing or an unexpected traumatic event.