Flopped nuts, first to act. What to do HU...

[Toddy]

The other night on the $175 double SO i was down to HU. In the BB with 48 flop 567. My play so I check (should i have led out??) so he checks behind me. 2 hands later I get crap so I check and he bets out!! Next deal I have AQ and flop KJ10 so I check, and he checks behind me!! Almost like he could see what i Had .. Do you usually make a probe bet when flopping nuts to make it seem like you're stealing?