Ulta Beauty

I was hired as a part time employee, during the interview I explained how I had a full time job and I was only looking to work between 15-20 hours a week. I explained how my full time was priority and that the scheduling would be based on what I was scheduled there. The manager, Steven Martinez, said that it would be no problem at all. My first week I was scheduled only for the orientation and cashier training. I had to be out for a medical procedure the following week. The week after I was scheduled 32 hours and though I told him I could only work no more than 20, I agreed to work what he had scheduled me. That weekend I was asked to stay later at my other job which I called and notified them of this ahead of time. They said it was fine. The following week, I began to be sick, which resulted in my going to the doctor. I explained to Steven that my doctor said I needed to cut back on the amount of hours I was working and that overworking my body was affecting me. He said it was and it wouldn't be a problem at all. The following week, I called to find out what days I would be scheduled and he said that he have me the week off to get better, I said ok and we agreed to check back the following week. I called at the beginning of the following week and he said that he needed someone that would dedicate 100% of their time to the company and that he hadn't scheduled because he didn't know that I could dedicate my time. I explained that my full time job was never a secret as I was hired for part time only. He said that he doesn't see a way of working things out anymore and then I asked him what exactly was he saying, was he firing me and he responded yes. I said ok, stunned, and I hung up. How unfair was that?