Trouble with Boss

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I worked for this boss for around 7 years. At first he appear to be a good boss. But as time went on he started to get on my case. Not sure what was to problem because I did like he want and more. He gave me bouses but never said anything about how good I was doing. Some of my co-worker said I was trying to hard to do a good job and this was making him mad. This did not make sense. The job I was doing was not hard and I was alway good at it. I repaired PC and laptop since 1990 but did not start it with this company until 7 year ago. Then it got to the point he removed me from this position. He also kept telling me that he was needing me to stay later even when my work was all done. He also told me if things got bad that I would be one he would let go. But the next time I would see him he would act like everthing was ok. All the co-workers that I was working around me said it did not make sense because I was alway working none for our customer were complaining about their pcs. I changed my job just to get away from him. The new boss said I have a very good rep. and was very impressed with me working with him. But I still do not know what I did that cause the old boss to act that way. I was told to forget it but how do I prevent it from happening again.