J
jaded848
Rock Star
Silver Level
B
BluffYou123
Back in the Game
Silver Level
^This is what you should do.
And just keep the pots small when you don't have a hand.
You don't need to play bad hands if he's gonna pay you off with Jack hi.
bgomez89
Resident Thugmaster
Silver Level
lol are you kidding?
OzExorcist
Broomcorn's uncle
Bronze Level
If you can't analyse your opponent effectively then what you have to do is stop playing HU. It's a game that is almost entirely based on reads.
Which means that without providing us any reads your initial question is almost impossible to answer. Though there could be several rational explanations.
If you're one of those players who's taken the "aggression is the key to winning at heads up" message to heart, you're raising every button and c-betting every flop then you'll be very easy to adjust to and it'd be perfectly reasonable for someone to call you on the flop with air, with the intention of either catching or just bluffing you off the turn or river.
If he's got a read that you bet small when you want your opponent to call and big when you want your opponent to fold, again, the above logic applies and it might be perfectly reasonable to float you and then bluff the turn.
Or he really might just be a drooler hoping to catch a jack, I don't know. Point is there can be rational explanations for an action like that and they're all based on reads. Get good at making them yourself because you can't win at HU without them.