What did you say to him?
Maybe he has just had a fright or something has made him a little jumpy so he doesnt feel as confident as he did.
Just take it back a stage, and encourage him, regain his trust and I always find bribery works well too, in encouraging the required behaviour (works for kids - works for hamsters - works for men
actually - works for me too
)
Im sure he will soon allow you back into his good books