Pot isn't big so I could fold. With numbers like that, I'm thinking he could have two pair..I doubt it, but more likely he played J3 or JJ, and you're WB. From experience with a couple of similar hands, loose passives come alive like this with very big hands.

Edit: I might call down to see the hand for future reference, and make a note.

2nd Edit: Am I the only one who believes this type of player rarely looks up from his own two cards? The majority of the time they aren't thinking about what others are playing. It just doesn't happen. Put yourself into the mind of a LPP and try to see how he thinks. C'mon OP has been aggressive all the way, and this guy donks when a Jack comes. He may have two pair but his re-raise makes me seriously doubt it.