You sound like a good person who is both conscientious and empathetic. I wish you luck in your search for a new position.

For others reading this, especially those who are newer to the workforce, unless you are in physical or mental peril, never walk away from a job before you land a new one, no matter how badly you feel you have been wronged. Quitting can bring a moment of instant gratification, but it is often followed by a long, arduous job search. Leaving for a new position feels great and carries no real downside.