I understand what you are feeling right now. You are disappointed and no one can blame you if you feel like that.

As for quitting your job, I congratulate you! At least one of your burdens have been taken away. Redeem yourself. Don't dwell in the negative side. Find another job that will make you happy and make you feel proud of yourself. Be critical in choosing you employer.

And as for your lover, "the truth will set you free!". Tell him how you feel. It will make you feel guilty but then continuing your relationship with him will cause more pain not only to you but to him as well...

I hope you can find your courage! And don't forget to move on!