and someone else continues to have a relationship with them, despite being upset by their dickish behavior, which of the two people involved is ultimately responsible for the bad relationship?

is it he person who is being a dick, knows they are being a dick, but doesn't want to change at all and is happy as larry in the relationship.
or is it the person who is not being a dick, is less happy in the relationship, but won't take action to force a change?

hmmmm

badly explained i think