UTG min raises to $4. He has a full stack as do I. Hes been splashing around in alot of pots but I havent seen his cards yet. Ive seen him do everything from bet, get raised and then lead the turn....to raise and bet and fold to a reraise...to get raised on the flop, call..and then check raise the turn. I have no idea what hes doing since I havent seen his cards but he is involved in alot of pots and staying about even. I have seen him raise preflop yet.
Ok, so he min raises. Im UTG +1 and I raise to $12 with
[Ks]. Its folded back to him and he calls.
The pot is $27. The flop comes
[Jh][4s]. He leads into me for $12. I called with the intention of raising the turn big. This was probably a mistake thinking about it afterwards.
Pot is $51. The turn is the
. He bets something like $15-$20. I raised to $75. He then went all in. The pot is about $310 or so and its a little over $100 to me.
What do you do and what do you think he has?

had fallen instead.