At the very least, you should be able to provide reasons for leaving your previous employer. They might be as benign as "I wanted to grow in X direction and the

At the very least, you should be able to provide reasons for leaving your previous employer. They might be as benign as "I wanted to grow in X direction and there wasn't the opportunity for that" but no-one has 100% rosy feelings about a company that they're leaving. I would be fairly distrustful of anyone who pretended that was the case. What is your worry about saying negative things?