1. He's your boss/employer...he doesn't neccessarily have to tell you anything
2. If you have performed to the best of your ability, you have nothing to fear...tell him so
3. If he's unreasonable, discuss the issues with him calmly and sensibly...if he remains unreasonable there's not much you can do about it.
4. Do not burn any bridges....there is nothing to be gained from telling him to fuck off
5. If neccessary be gracious in defeat and live to fight another day
6. Don't pre-empt what he may say...be prepared for all possibilities
7. He will not say anything unreasonable if he's asked you to bring a witness
8. Stay cool

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