Without reads it's difficult to know but I don't think you can give villian a Q here 100% of the time. At .5/1 people can do strange things. It's conceivable that he is betting his flush draw or wants to see if you have a Q or is his JJ still good. I might lead out again on the turn and see what villian does. If he calls I'd do it again on the river if a non-D shows up. If I'm running bad I may just c/c down and cry a little when he turns up Q4o.