what the hell it was!

I only have classes at night. But one year ago, I had NEC English class in the morning from Monday and Friday. There were about 20 students in it. I tried my best to gather lots of useful materials for them every day. And I also did my utmost to explain the profound things in a simple way and gave them a lot of exercises to go over what they learned. Because most of them just learn it from ABC. We spent many happy days together. But one day one student told me that some of them wanted to welcome another teacher instead of me. They did not love me. Suddenly, I felt shocked me what he said to me. I really felt extremely disappointed. Because they said I was a inpatient, irresponsible teacher. If I was not be replaced, they would all ask for leave, and never learned English here. How serious it was! My god! I talked to them one day. But they all did not admit that they said like that. I explained with them, but finally I did not find out what the hell it was! Our leader talked to me later. She expressed her sorry and sadness to me and confirmed my qualification of teaching and my responsibility for the students. Of course, the students were the Gods of the training center. At last she undoubtedly changed me.
Few months later, some of the students told me the ones who strongly appealed to change me did not appear in the classroom. They played a ridiculous trick on me! I was greatly shocked for the second time. I began to doubt the feeling between teacher and students was really existing or not. Or was there any respect between us?
Perhaps because of this, our leaders will never offer me a chance to teach students in the daytime. Are they disappointed about me? I did not ask them reasons for that. But I know what I should do now is go to teach the students well in my heart and soul, which is the first important for me.