Sweet merciful crap, you get faced with a lot of tough descisions golfer.

A big part of this descision is if you think there's any chance of him making this play with 2 pair hands. The pre-flop raise wasn't big, so it just might be possible if he's at all loose to have seen the flop with JTs, KJo/KJs/KTs. If so, would he play a 2 pair hand this hard with this board? If yes, you have to call. If no, we have a tougher descision. AQ is a hand that makes perfect sense for him to have, and you're beaten by this (although you have outs). KK is possible, but unlikely. If he has KK he limped it and didn't re-raise, so KK is almost safe to rule out. Unfortunately so is AA (which you beat). TT also makes perfect sense for him to have considering the pre-flop action. AQ is about 16:3 more likely for him to have than TT. Not good.

So in conclusion, you need to figure out if he'd play KJ/KT/JT or even AK this hard with this flop. If he would play those that hard, it's a call. If he'd only play KJ that hard and not the other 2 pair hands, it's really borderline (but I think still a call) since it's about 16:12 that it's AQ vs. TT/KJ but you have money in there and outs vs. AQ. If he wouldn't make this play with only 2 pair I think it's a crying fold.