You came in promising "A good deal or no deal" on Brexit and you delivered neither.
Don't let the door hit you in the butt.
David Cameron resigned because he opposed Brexit - which was the right thing to do. Unfortunately, his replacement was Theresa May, who was also pro-EU and opposed to Brexit, and was only willing to implement Brexit with a thousand strings attached and with the greatest reluctance.
Those who think May was incompetent are probably mistaken - my take is that her goal was to sabotage Brexit while pretending to move forward on its implementation. In that regard she was extremely competent and effective.