I am so sorry. I am not a working woman, but that does not keep me from feeling badly for you. I do not blame you for being upset, most people in your position woud feel the same way. If you feel strongly about it, there is no harm in looking at other jobs and seeing what is out there. You have a job while you look and it is always easier to find a job, when you have a job.
I truely wish you the best and hope you can work out your feelings, as I am sure it is hard to go to work and face them right now. I cannot imagine helping someone prepare to apply for a job and then knowingly taking it from them, that was very wrong of him. If he was going to apply for it, he owed you the truth so you knew he was going to do that.
Again, I am sorry, I hope you can work through your feelings so you can stay where you are as it seems you do like your job. If not, I truely hope you can find another wonderful job to take its place. Stephie