this is a though one i think.villian limps UTG,then he calls your raise of 5BB getting something like 2.5:1 odds(very rough estimate) ,then he checks,abd then calls your pot sized bet...
what range of hands do you think would justify that kinda play?
unless he is a total donkey (which im not saying he is not)then i think he either made a set on the flop,or his got something like JTh.i would say just check here and try to get a chip show down.